I'm getting TKed in co-op by people who don't even realise they're TKing me.
We can't see friendly markers unless we've already been aiming at someone for a certain amount of time. How is that useful when 1-2 shots kill a friendly? Oh, and at a distance more than a stone-throw too.
And some more notification other than a standard message in the chat window. Like "HEY FUCKER YOU'RE KILLING A FRIENDLY" through their headphones? How about that?
Something needs to be done about it. It's flat-out ridiculous the amount of accidental TK going on.
(Whatever happened to 1:1 TK-self damage? People sure learn quick with that rule in place.)