After the round is over, there really isn't much anyone can do.
The TK rules are meant to prevent the tides from switching mid battle simply because someone was being a moron.
After the round is over, we can speak to him to discourage similar behavior, but sadly, there isn't much beyond that. You could ask him to stop doing that to you, but honestly, it's not a ban/kick worthy offense simply because it does not affect the flow of the round at that point.
If I see any behavior like that, the offender will - of course - receive a warning.