"I play as I want, fuck you noobs." - No you don't. You play by the rules.
That means you don't teamkill, even if you're "dueling", go to the duel server if you want to do that.
This will be his 8th ban, 3rd for teamkilling.
Banned for 20 days unless another admin deems it worthy of upping it to an essay or perma.
Tenne.