Well, apparently not all Niners and Seahawks fans are BFFs.
The punch came after Richard Sherman picked off Colin Kaepernick. Comments under the video suggest the victim was the Niners fan’s cousin, and had suffered a few love taps to his groin from a nearby female fan over the course of the game.
Explains one comment: “Right before he punched his cousin (Seahawks fan) in the mouth he got hit in the groin once again by the same girl and then subsequently tapped in the stomach by his cousin in jest. That was enough to make him snap.”