Wasps played over three quarters of their Premiership clash against Harlequins with 14 men but moved back into the top three with a 44-22 victory at Twickenham Stoop.
The visitors lost Kyle Eastmond in the 16th minute for a high shot on Quins fly-half Marcus Smith that prompted a series of altercations between the two sets of players, but they ran in four of their six tries despite the numerical disadvantage for a bonus-point win.
Wasps made a blistering start through scores from Juan de Jongh and Thomas Young inside the opening 10 minutes, but the hosts were handed a boost when Eastmond saw red for an out-of-control tackle.
Tries from Tim Visser and Aaron Morris brought Quins level early in the second period, but two in the space of three minutes for Wasps - Young getting his second before Willie le Roux finished a sweeping move - put them back on top.
England international Nathan Hughes made his first appearance since October having been sidelined by a knee injury before Tom Cruse and Charlie Matthews exchanged scores after Archie White was sent to the sin bin.
Josh Bassett dotted down a grubber from Danny Cipriani with four minutes remaining to complete a thoroughly impressive victory for Dai Young's side.