I don't have 80 pairs of eyes to watch everyone unfortunately.
Nindurr said he'd watch the person. He will / did. I also spend 2-4 rounds in spec watching players - and sometimes... nothing. The guy is clean and not doing anything wrong aside from the one team-wound earlier.
If we don't see it happen, we can't make the call. Screenshots help - reports help. I write down names on paper and refer to it when I spec the players.
If there's a case where I read in chat a name being called out a few times for "intentional" team-wounding but I did not witness it - I will turn on Kick Polls, start the poll myself and let the community decide the player's fate.
This is warfare, shit happens, combat is messy - get over it.
If you revenge tk or.... "get even" (don't be a smartass birds
) you only take the risk of being removed yourself. Sometimes the admin will just remove both if he's not sure who "started it". We aren't detectives - play nice and don't create a doubt in our minds.