As an observer, and not the person being beaten down, I learned a long time ago to never get in verbal, then in any physical altercation with a wrestler. Once i started to grow and figured out I was stronger than some I got a little cocky, then realized..... step; back, and shut up. Wrestlers will F up any man, any time, with minimal effort.
Rule number two was to stay away from stout looking hockey players that drank a lot that day, if any fight was brewing. In fact, I'd give a wide lane to 5'9" 170 lb hockey player that looked sort of pissed off. One such ex hockey player came at me from the side with a heavy barstool a few years back, I ducked and he grazed my shoulder... The guy got 86ed from the bar, but maybe I had it coming! We'd probably laugh about it if we ever crossed paths again. I was talking to his female housemate who had a different view of their relationship. I was not even into her!
Third place I am not sure, my brother played rugby out east and my understanding is that group is one to avoid unless an insider. They will F you up, and stand together post match; big drinkers with no fear of anyone. My mild mannered brother probably did some crazy stuff he blotted out of his mind from those days in Rugby.