A bit of a bite is no reason to kill a ferret, soft buggers Wish the worst thing I'd ever been bit by was a ferret.
Worst ferret bite I ever had was a tooth through my thumbnail, the hob was pissed and not wanting to let go, just gave him a quick dip in some water and he let go. Never bit again and if I'd knocked him on the head for that one bite, I would have been cheating myself of a great worker.
Dip in water if handy, Stubby's method works well also