but sharks and killer whales and other predatory marine animals will bite their victim's tails off, so that they cannot swim away - then they are easy prey.. with both cats having their rear legs damaged, that, to me, sounds like a predatory strike so they couldn't run or climb away.. I could easily be wrong, but that's what occurred to me.. Best of luck with this kitty cat.. so sorry to hear about that..
Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..