It would not surprise me in the least if more than one of the combatants involved in this melee wound up looking like Colin Kaepernick. Hell, that could have been the reason behind this fight. GOTTA LOOK LIKE KAEPERNICK, BRO!
Just kidding. I'm sure there is a perfectly valid excuse for grown men to engage in physical violence and get kicked out of a professional football game. Perhaps someone suggested Andrew Luck barks out the signals too loudly. Perhaps someone suggested Jim Harbaugh would make a poor dinner guest.
Whatever the impetus, cooler heads did not prevail.
[H/T: The Big Lead]