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First he clattered into Jonny Evans with both feet off the ground and both sets of studs showing. Then Liverpool's Jonjo Shelvey received a deserved red card against Manchester United
As an encore, Shelvey leveled an accusatory finger at United boss Sir Alex Ferguson on his way to the tunnel.
"That's your fault," Shelvey bellowed at Ferguson, as if Ferguson had forced Shelvey's feet off the pitch and studs into the air.
If Shelvey meant to suggest that Ferguson wields too great an influence on referees' decisions, well, then he might have a point. He chose the wrong way to express himself, though, and anyway, big-picture questions about Ferguson and referees won't ever condone Shelvey's awful challenge.
Inevitably, the match and its most memorable incident have prompted plenty of debate. One could argue—as Liverpool manager Brendan Rodgers did—that if Shelvey deserved red for his two-footed challenge, then so did United's Jonny Evans.
Even after multiple viewings of Mark Halsey's fateful decision to award United the game-winning penalty, it's hard to know whether Halsey's call was right or not.
While it's questionable whether or not the correct team won Sunday at Anfield, it's just as difficult to say how well the referee—who turned out to be the match's most important actor—performed.