The visitors had scrum-half Danny Care yellow-carded for persistent infringement just before the break and Bristol took advantage when wing Anthony Elliott linked up with Rob Higgitt to put Lemi clear to score in the corner.
Ismael Bouzid, who had been booked in the first half, avoided a second yellow card after tripping Barry Douglas early in the second half and the defender was soon withdrawn to be replaced by Andrew Driver.
Scrum-half Care's yellow card in the 69th minute, for a shoulder charge on Marcus Horan, was particularly galling as, at that stage, Ireland only led 11-6.
The visitors started to get back into the game and after Gloucester scrum-half Peter Richards was yellow carded for a second show of dissent, they looked the more threatening.
After the break, Melling went over after a tidy Randall pass and Wildcats scrum-half Jeremy Smith was shown yellow for dissent.
Ryan Taylor's brilliant 20-yard strike put the visitors ahead early on but Emmerson Boyce was harshly awarded a second yellow card after half-time.
Munster's chances of recording their seventh win in eight league games were dented by two sin-binnings - Niall Ronan and Doug Howlett saw yellow in each half - and Connacht, who moved ahead in the final quarter, had the physical and mental strength to hold on.
Bath's discipline deserted them in the final stages of the half with Justin Harrison lucky not to see yellow, but Hooper was less fortunate and on the stroke of half-time he was sent to the bin.
Half his building (at 9006 Yellow Brick Road, in an industrial park 30 minutes outside of Baltimore) operates in bingo-card black-and-white.
Lock Simon Shaw was shown yellow in the first half for a trip on Brian O'Riordan, while second-row partner Richard Birkett followed after the break for elbowing Matt Salter.
Ulster fought hard to find a scoring response but were hampered by two yellow cards in the second half.
Scholes was sent off in the second half after he picked up a second yellow card following a clumsy tackle.
BBC: SPORT | Football | My Club | Man Utd | Rooney & Scholes lose ban appeals
Puyol was sent off and misses next week's second leg, as will Fabregas after he picked up a yellow card in the first half.
The biggest flashpoint of the match came when Montpellier flanker Jerome Vallee was shown a yellow card in the first half for throwing a punch at Mayor.
Earlier, Junior Paulao scored as Real Betis moved up to third with a 1-0 win over Espanyol, who had midfielder Wakaso Mubarak sent off for a second yellow card in the second half.
To make matters worse for the visitors, Davey showed yellow cards to scrum-half Aidan Thomas and lock James Hanks, one exactly 10 minutes after the other, which meant Exeter played a quarter of the game a man short.
Barkley missed another penalty with four minutes of the half remaining but, after Bath skipper Michael Claassens was shown a yellow card for a high and early tackle on David Strettle, Quins fly-half Nick Evans made no mistake with two penalties to give his side hope at the interval.
Once, it had collected pupils spread out over half the county in a fleet of shiny yellow buses.
These trucks are decked out in classic Indian style: half fairground carousel and half Hindu temple, with vermilion and sunshine yellow as the favoured colours.
Hernan Losada scored the decisive goal in the 36th minute before his team had substitute Darryl Janmaat red-carded on 76 minutes, then Patrick Ebert received his second yellow three minutes into second-half injury-time.
The bright yellow cover of Power Questions is not half as bright as the simple ideas to be found inside.
Bath lost a second South African half-back to the bin when James was yellow carded for a reckless tackle but they finished the match, as they had started it, well on top.
Racing scrum-half Nicolas Durard settled for the option of a yellow card to prevent a likely Leinster try and the home side's decision not to accept three certain points backfired when Heaslip spilled the ball short of the line.
Leinster suffered a blow 10 minutes before half-time when lock Leo Cullen received a yellow card for taking out a support player as Scott Morgan gathered a lineout ball but Dragons were unable to make their numerical advantage count.
In Sonoma County, the Yellow Fire north of Calistoga was less than half contained after burning 125 acres.
After the break James Morrison headed a good chance wide for the Baggies, who had half-time substitute Jonas Olsson dismissed for two rapid yellow cards.
However, Ashley Cole, who was also on a yellow card but came out for the second half, may not face Russia after he was carried off just a couple of minutes after the restart.
By two-and-a-half minutes, the entire background is swathed in green and yellow, red and white--it's like a Venn diagram on steroids.
The half ended with Juan Martin Fernandez Lobbe and Raphael Ibanez receiving yellow cards after another heated exchange, but the start of the second period was engagingly open.
Fundamentals for the yellow metal look promising, at least in the first half of the year.
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