Quitting a game isn't ban worthy considering you can't know for sure if they quit at that moment on purpose or because they had real life stuff to do.
There isn't even a posted rule that you're supposed to fight until the end.
If the staff said they won't warn/infract/ban him for it, then they won't warn/infract/ban him for it. They make the rules. That's how it works everywhere.
ok, rl is a good reason ,but if the guy said after asking why i have to fuck myself and screen it - that is for me a reason to ban
but i give it up for now and live with the nice philosphy of the even nicer admins