I had this situation:
4 players on a server running arena_warfare
after some roudns of playing (it was me and another guy playing) I noticed that this guy was afk. well, what I did: I kicked him, while hoping that the round would end then.
However, when I kicked him, the round was not over. there were still the other two spectators and I was playing. I then decided to kill myself to end the round, but what happened: I was invulnerable. even "kill" command in console didn't work. I then reconnected to get the game going again.