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Kompany was fouled, but he then lost his head and had to go off.
Any observer who only recently began supporting Manchester City would fairly wonder why the Sky Blues so often end matches with fewer players than they start with.
Both ends of Manchester City's Champions League tie with Barcelona saw Manuel Pellegrini's side finish with 10 men.
The first red card was the result of a grievous defensive error by Martin Demichelis. The second came from a petulant loss of composure by Pablo Zabaleta. Both instances were regrettable.
Against Hull City, though, Manchester City lost a man for a far more defensible reason.
Captain Vincent Kompany was the last man back when he misplayed a good back-pass from Javi Garcia and invited Hull City striker Nikica Jelavic to pounce. Jelavic might have fouled Kompany, but Kompany's response was overaggressive with Jelavic a half a step past him and the red card that followed was just.
Kompany was livid, as he felt that his foul would never have happened had the Jelavic infraction been properly called.
Still, Kompany did the right thing even in getting sent off. Manchester City could ill afford to concede the opening goal so early in the match given their fragile road form.
Kompany surely did not process all of the variables in the moment, but given the gap in quality between the sides, Kompany was ultimately correct to trust that 10 of his men could handle 11 of Hull City's without him.