You can't kill a teammate no matter the reason. Try to keep it civil. You can report teamhits, nudge someone away if he is blocking your path, or make a poll (preferably at the start of the round, specifying the reason in chat), but don't teamkill!
And Pawiu, please try to get a screenshot or two more, outside the chat log, to see the situation, the next time. And GTX and Kuoin, if you didn't witness it, you shouldn't be posting in a ban request. It's more text to read for the admin and we have opinion too.
Xesta is banned for 6 hours (first ban).