I don't know of any admin that would perma-ban for one instance of TK'ng. If they did I think we would mildly discuss their rush to judgement.... Seems lately I have found some would be righteous spots for strategic belly lying, then I end up with a few TK's. 99% of the time it's just "crap happens". You may hear an apology, you may not. Doesn't mean they intentionally TK'd anyone. But if you got banned for it, odds are there is more to the story...
~Sluff~
i've seen it happen.. won't give out any names.