Huddersfield's cause was further hindered when Lee Gilmore, already placed on report for a challenge on Morley, became the second player sin binned.
However, Wales fought back from the second-half sin-binning of Farrell's opposing No. 10 Rhys Priestland and drew level with fullback Leigh Halfpenny's fourth successful kick.
Leeds' position was made all the more precarious when number eight Rhys Oakley was the second visiting player sin-binned with eight minutes to go.
In the second quarter two Glasgow players ended in the sin bin.
But two Cipriani penalties, the second after Munster prop Marcus Horan was sin-binned for coming in the side of a ruck, brought Wasps to within four points.
Gloucester carried that momentum into the second half and after Ben White was sin-binned for slowing down the ball, they moved the ball right after a quick-tap penalty for Simpson-Daniel to score and Robinson converted from the touchline.
Matters grew more depressing for Viadana in the 22nd minute when second row Fabio Gumiero was sent to the sin bin for what appeared to be dissent towards referee Hugh Watkins.
The Dragons, who had Raguin sin-binned seven minutes into the second half, conceded further tries to stand-off Ryan McGoldrick and Adam Fletcher to put their lead at risk but Mounis came to their rescue with his late try.
The home fly-half found himself in the sin bin on 46 minutes for the second match running, although his trip on Williams looked accidental rather than deliberate.
Two more successful kicks from Biggar, the second coming after Munster number eight James Coughlan was sin-binned for hands in the ruck, left the home side with a mountain to climb at 15-3 down.
The South Africa flanker was sin-binned in the first minute of the second Test on Saturday, which his side won to seal the series, and was cited afterwards.
Even when John Mallett was sin-binned for the second time in two weeks, this time for punching, Castres failed to make their numerical superiority count.
On Saturday, Lee Byrne's missed kick to touch was gleefully seized upon by New Zealand, who led just 13-12 at the time and had Daniel Braid in the sin-bin, and ended with Hosea Gear scoring his second try of the match.
Jarvis was sin-binned early in the second half and Bristol took advantage with a penalty try.
After McAlister was sin-binned early in the second half, Thierry Dusautoir took advantage to score and level the game.
Things got worse for Bristol early in the second half as former captain Matt Salter was sin-binned for obstruction, with Leicester taking advantage through Flood's try.
Magnify the second of these sins, with a wicket, and the definition of Test cricket's deadly sin lies right in front of your eyes.
Byrne was in danger of going from hero to zero after his second-half sin-bin but the 14-man Ospreys defence kept the Blues at bay.
Sexton made the score 22-6 just after the start of the second half and although Leinster wing Isa Nacewa was sin-binned on 49 minutes for a high tackle on Alexis Palisson, Brive could not take advantage of the 14 men.
In contrast the Blues chose to boot two difficult penalty chances to touch, the second leading to a sustained assault on the Northampton line that saw Saints centre James Downey sent to the sin-bin for killing the ball.
The turning point, with the game locked at 13-13 midway in the second period, came when Bristol prop Darren Crompton was sin-binned for a high tackle.
Quins were thrown a lifeline in the second half as Gloucester played half the period with 14 men after props Paul Doran-Jones and Nick Wood were sin-binned.
And it is considered a sin of sorts to order a second of the same.
WSJ: Second Thoughts: How to Follow Your First Bottle | On Wine by Lettie Teague
Second, because there is sin and virtue in the system itself to which we are all subject.
"Second half, I thought the defining moment was the Nathan Hines sin bin, " added Robinson, who cast doubt on the validity of the decision.
With Leamy - for hands in a ruck - and Simon Shaw - for not retreating 10m - in the sin-bin, O'Gara sent over his second penalty for a three-point lead.
The 30-year-old added that he was not happy with his sin-binning after coming on as a replacement in the second half of the 16-13 Magners League defeat by Edinburgh at Ravenhill.
Leicester pulled away in the second half but only secured their bonus point when replacement prop Rob O'Donnell was sin-binned in the last minute and Crane powered over.
Referee Nigel Owens lost patience and sin-binned prop Salesi Ma'afu and the Wallabies duly conceded a second penalty try after their pack had again been taken apart at a five-metre scrum.
But Scarlets exploited the numbers when visiting prop Ronan Loughney was sin-binned, Jonathan Davies crossing for his second try before Lamont struck.
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