1)Is it ok to KOS a T buddy, if you know he is dead? 2)Is it ok to KOS a T buddy, if he was already KOSed by numerous players a short time ago? The general conclusion from the rules telling that both cases are not allowed, however I have seen mods and premium rank players doing both the cases, and not getting punished.
1) Perfectly fine 2) Shouldn't do it cause you can be held accountable for your T buddy's death, if he gets shot for your KOS.