I don't know what led to that play, but I have watched the fight. Garrett shouldn't play another game this year and honestly, maybe should not play again period. I don't watch the NFL much at all, but I know this was not normal.
Hits the quarterback, thats fine. Pulls him up by his helmet, pulls his helmet off, and then hits him with it? There is no place for that in modern football. Could have killed the guy. These guys already bash each others brains in every week.
Pouncey may get dinged too but what is he supposed to do there? Can't just let opposing players rip off a teammates helmet and use it as a weapon against the guy.