Keep your eyes on the upper left corner of this video.

The first reports were that the guy in blue was a Cowboys fan, but TMZ got more details. Apparently both were Eagles fans attending the game in Dallas, and both were brothers. The one throwing the punch is Jorge Castillo, and the one who got KO'd is his brother, Ignacio Castillo. Jorge was arrested for misdemeanor assault with bodily injury, and once Ignacio leaves the hospital he will be arrested for allegedly spitting blood on a cop. A third Castillo brother, Jose, not involved in the fight, was also arrested for disobeying the police.

Here is a much longer video, with the above punch coming about one minute in.

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