Vincent Kompany should not have dived in, but he was in control of his body movement, unlike Frank Lampard for Chelsea against Wolves, which resulted in a yellow card but was a much more serious offence.

Controversial: Vincent Kompany was sent off for this challenge on Nani
You could argue that Kompany’s tackle was not even a foul. Nani, who is not slow to make a meal of these things, didn’t even complain.
If the referee wanted to make his mark early in a derby game, which is
possible, then it was a yellow at worst.

Seeing red: Chris Foy sent off Vincent Kompany in the Manchester derby
I wasn’t impressed with the reactions of Wayne Rooney and Michael Carrick. They applied pressure to the referee to produce a red card.
It was a game that, once again, called for extra officials behind the touchline, as with UEFA games.

Appeal: Manchester City players were convinced Phil Jones handled the ball inside his own penalty area late on
They would have helped with the referee missing the Kolorov trip on Valencia that should have been a penalty and the Jones handball, which should also have been a spot kick.
This huge game was not a good day for the officials.
Read more: http://www.dailymail.co.uk/sport/footba ... z1iuoM2g63