i almost had a similar situation happen when i was doing intramurals some 6-8 years ago. i was lucky in that the supervisor of the facitlity the games were played at was an ex olympic bobsledder -- and by ex I mean by about a year or 2 so the guy was only about 6'4" 230-240 about 3% body fat. 2 players tried to jump me from behind while i was leading and he just grabbed them by their shirts and lifted them and told me to head on home he would deal with it.
turned out he took them to his office, sat them down for about 10 minutes and then made them leave. when they left the 2 guys were balling their eyes out and shaking -- to this day he never told me what he said but I can only imagine
-- the 2 guys werent exactly tiny either its just that this guy was a beast.