ThunderClan warriors don't kill unless they have to

You put quite a fight for a tame kitty

A leaf cannot return to the bud
- bluestar to fireheart and greystripe

I'm going to die whatever you do, but I'm not afraid.

You speak from your heart, young Firepaw. This will make you a stronger warrior one day." said Lionheart
Tigerclaw growled. "Or it might make him give in to kittypet weakness right at the moment of attack

Keep your eyes open, Fireheart. Keep your ears pricked. Keep looking behind you. Because one day I'll find you, and then you'll be crowfood.