"How about this: When you are thinking more clearly we can organize something with slightly more of a plan? I wouldn't mind taking down one of those green-eyed creatures. Might be useful to find out what happens - if they come back as we do, or if killing them keeps them dead."

Because he does want to kill one, or at least fight them again. But not.. like this. The claws may be useful, but he's more concerned that Quentin will do something unexpected and dangerous. Kuai isn't about to take an unnecessary risk like that.