Sean Pollard, 23, was surfing at Wylie Bay when the predator, believed to be a great white shark, attacked him on Thursday morning.
Witness Robbie, who was planning to give his nephew a surfing lesson at the beach, told 6PR radio: "He's obviously swum about 100m with those injuries ... it was probably the bravest thing I've ever seen."
Two men pulled him out of the water and an off-duty paramedic at the beach helped stem the bleeding. Robbie added that Mr Pollard may have died if the paramedic hadn't come to his aid.
"He was really unlucky but he was really lucky to have had the help he had when he got to the beach by those three people - the two guys that pulled him out and then helped dress his wounds, and the paramedic on the beach, you couldn't give her enough props really," he said.
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Esperance Police Senior Sergeant Richard Moore told Perth Now that the assistance of the volunteer in the crucial first few minutes after the attack was "vital" to Mr Pollard's survival.
According to the Huffington Post, Esperance Shire President Malcolm Heasman said the victim lost one arm below the elbow and the other at the wrist, likely from trying to fend off the shark.
He also had lacerations to his legs but was in a stable condition when he was flown to a hospital in Perth for treatment.
Heasman added that when police retrieved his surf board it was covered in bite marks.
Beaches in the area were closed following the attack and officials caught and killed two great white sharks.
But Sky News reports that Humane Society International urged the government of Western Australia to close beaches and use warning signs instead of killing sharks.
It said: "Simply killing sharks will not reduce the risk of a shark attack."
10 Easiest Places To Get Eaten By A Shark
"Brave" shark attack victim swam 100 metres with only one arm
New Smyrna Beach in Florida has the dubious honour of having more shark attacks annually than any other beach. The beach is part of Volusia County, which accounts for roughly 37% of Florida’s 663 attacks since 1882.
It is estimated that anyone who has swam there has been within 10ft of a shark, according to National Geographic. However, there have never been any fatalities on New Smyrna.
However, that can't be said for the rest of Florida. Since 1988, there have been 6 fatalities.
The number of fatal, unprovoked shark attacks in South African waters between 1990-2009, is 22, according to the KwaZulu Natal Sharks Board. There have been 136 attacks in total.
In 2012, there were four shark attacks in South Africa, three of them fatal, according to the International Shark Attack File.
Picture: A woman enters the water as workers aboard a boat, right, place a shark exclusion net at Fish Hoek beach, on the outskirts of Cape Town, South Africa, Friday, April 5, 2013.
There have been 207 unprovoked shark attacks in Australia over the last 20 years, and 124 of those occurred in the last 10 years, reports Australian Geographic.
According to The West Australian newspaper, Western Australia has become the deadliest place in the world for shark attacks, after the fourth death in seven months occurred in 2012.
Picture: Shark warning sign on Botany Bay beach. Sydney, Australia.
In the past 20 years Brazil has become an increasingly hazardous place to go swimming.
While the north-east coast might have a stunning coastline and bath-temperature waters, the BBC report that off the shore of Recife are many aggressive sharks, which has made this one of the most dangerous places in the world to swim.
Brazil's sharks appear to be some of the most dangerous in the world. The death rate of 37% (21 of the 56 attacks in 20 years) is much higher than the worldwide shark attack fatality rate, which is currently about 16%, according to the Florida State Museum of Natural History.
Picture: Placard warns about a shark hazard in Boa Viagem beach in Recife, northeastern Brazil on September 11, 2012.
After 14 unprovoked shark attacks were reported in Hawaii in 2013, according to hawaiisharks.com, locals have become increasingly nervous about the risk posed by sharks
From 1828 to December 2013 there have been 128 total unprovoked shark attacks in Hawaii, 10 of which were fatal attacks, according to the International Shark Attack File at the Florida Museum of Natural History.
Picture: Japanese tourists stroll along Waikiki Beach in Hawaii, following a shark siting in 2001, which closed the beach.
California has had 109 confirmed unprovoked shark attacks since 1926, according to the International Shark Attack File, and the state ranks second in the U.S. for shark attack frequency.
There have been 10 fatal attacks, and the last was just two years ago in Santa Barbara in 2012.
Papua New Guinea has had nearly 50 shark attacks (half of them fatal) .
The Guardian report that the country has a disproportionately high number of shark attacks, considering its small population size, because of the country's location, with extensive seas coasts and warm climates.
Picture: Trobriand Island In Trobriand, Papua New Guinea
Since 1837, 71 shark attacks and two fatalities have occurred in South Carolina, according to the International Shark Attack File at the Florida Museum of Natural History.
Of those, 16 attacks are recorded off the beaches of Horry County, where the town of Myrtle Beach is famous as a tourist destination, according to Yahoo.
Luckily, there have been no fatal shark attacks in South Carolina since 1852. But in 2012, South Carolina had a worryingly high level of incidents, when five attacks were reported.
Picture: Myrtle Beach
Despite its size, New Zealand has a relatively high incidence of shark attacks, according to The Encyclopedia of New Zealand.
Since 1852 there have been 44 recorded unprovoked attacks (compared with 39 in the whole of Europe since 1847).
A third of New Zealand attacks occurred between Ōamaru and the Otago Peninsula, probably because sharks are attracted by the high numbers of seals, dolphins and pilot whales in that area.
Picture: A flower tribute at Muriwai Beach near Auckland, New Zealand, after a shark killed Adam Strange in 2013.
Mexico has had 42 shark attacks (22 fatalities) since 1880.
Picture: People walk along Troncones beach in Mexico's Pacific Coast village of Troncones in 2008, after sharks attacked three surfers in the area in less than a month, two fatally.
"Brave" shark attack victim swam 100 metres with only one arm
Back in 1959, Robert Pamperin was diving for sea snails in La Jolla Cove, California when he was attacked by a shark. His diving companion Gerald Lehrer painted a vivid picture of the events that day. According to reports, Gerald turned to see his friend rising unusually high in the water. He dove below the surface and saw his friend waist-deep inside the shark’s jaws. Despite his efforts to distract the shark, Robert was dragged to the sea bed in the jaws of the 22-foot shark.
Professional surfer Bethany Hamilton has proven that not even a shark attack can keep a girl down.
At the age of 13, while surfing off Kauai’s north shore in Hawaii, Hamilton was attacked by a 14-foot tiger shark and was left with a severed left arm.
After losing more than 60% of her blood, Hamilton required several surgeries, but she did not let the incident impact her dreams of surfing.
Miraculously, just one month after the attack, Hamilton returned to the water to continue pursuing her goal to become a professional surfer. Shortly thereafter, she made her return to surf competition; placing 5th in the Open Women’s division of that contest. With no intention of stopping, Bethany continued to enter and excel in competition.
Just over a year after the attack she took 1st place in the Explorer Women’s division of the 2005 NSSA National Championships – winning her first National Title.
In 2010 she was the 20th ranked woman among surfers and her autobiography Soul Surfer: A True Story of Faith, Family, and Fighting to Get Back was made into a movie with Dennis Quaid and Carrie Underwood in 2011.
When HMS Birkenhead struck a rock just three miles from the coastline in South Africa, the disaster was only just beginning for its crew.
After the captain commanded that ‘women and children’ take the undamaged lifeboats, the rest of the 643-strong crew made up of British and Irish soldiers, were left on board to go down with their ship.
Tragically, once the vessel sank, the men were not given the opportunity to swim to safety. Sharks surrounded the floating men and embarked on a feeding frenzy.
According to one report, in a very short time many of those who survived the sinking were dead. And on the surface of the water, which was covered in blood, floated the almost unrecognisable remains of those who had been attacked by sharks.
Just 193 people survived the disaster.
Rodney Fox was just 24 years old when he was viciously attacked by a great white shark, while competing in a spearfishing competition off the south Australian coast. It later turned out that they only thing keeping Rodney’s internal organs from falling out of his body -- and him alive -- was his wet suit.
After a nightmarish shark attack that left his ribs broken, one lung ripped open, the main artery from his heart exposed, diaphragm punctured and right arm flayed to the bone, Fox needed 462 stitches to put him back together.
Reports say that Rodney went on to design and build the first underwater observation cage to dive with the great white shark, and for over 40 years has led major expeditions to film and study his attacker.
The coast of New Jersey was struck by a series of shark attacks back in 1916. During a heat wave that saw Americans flock to the beach, four people were the victim of shark attacks.
According to The Telegraph, the first victim was 25-year-old Charles Vansant, who bled to death after sharks stripped the flesh off his thigh as he went for an early-evening swim.
Less than a week later, a 27-year-man suffered severe injuries to his stomach, and severed legs, while swimming at a beach just 45 miles from the first attack.
Six days later, further north up the coast, 12-year-old Lester Stillwell was dragged underwater as he played in the sea with his friends.
Tragically, attempts by his father to save his son, resulted in his also being attacked and bleeding to death.
When British naval ship HMS Valerian capsized during a hurricane, near the coast of Bermuda, the surviving crew members were savaged by sharks in the water.
There were 88 fatalities, most of them from shark attacks, according to reports.
As the sailors hung on the life rafts for dear life, sharks pulled some of them off and into the water, where they were bitten and chewed in a shark feeding frenzy, reveals sharkfacts.com.
Rescue boats managed to pull just 20 survivors from the waters.
Perhaps the most hard-to-read shark attack story of recent years was that of Ian Redmond, 30, who was attacked and killed in the Seychelles while on his honeymoon.
In 2011, Redmond went snorkelling 20 yards from the shore, where his new wife was sunbathing, and was attacked by a six-foot shark.
An American tourist told the Daily Mail that someone saw a fin sticking out above the water. According to the tourist, a woman then ran over, screaming, "That’s my husband! We were just married."
Redmond wasn’t the first man to be attacked off Anse Lazio beach, Paslin island. Just two weeks before, a 36-year-old French tourist was killed by a shark off the same beach.
In 1945, when two Japanese torpedoes hit the USS Indianapolis in succession, a chain reaction of explosions ripped the ship in two and of the 1,196 individuals aboard, just 900 made it into the water alive.
However, that moment was just the beginning of one of the worst shark attacks in history.
For four days the crew bobbed in the water while the sharks feed off their group, picking off the dead and injured first.
By the time a rescue crew arrived only 317 individuals remained alive.
According to Salon.com, estimates of the number who died from shark attacks range from a few dozen to almost 150.