Confirmed.
I saw him doing intended teamhits yesterday as well, he stoped when I warned him though.
However, I think this guy isnt doing that for griefing players, I think he jsut doesnt no the rules yet and is new.
In one screenshot you can see, that he asks "peace?

", so that I think he has no bad intentions or something, just thought it was fun. -> banned until unban request is written, so that we can explain him the rules.