I would guess Patrick Reed too but I'm honestly surprised there hasn't been an incident like this on the PGA Tour(atleast to my knowledge) before. You see tempers flare in every other sport yet I have yet to see anything in golf. Hell I've seen people get into shoving matches on golf leagues I've been on where the stakes are minute compared to the Tour, yet nothing has ever happened on the PGA Tour. I figure you would atleast see a shove, push, or screaming match between some golfers.