Grass and fruit are people too. They're alive and they have feelings and thoughts, so they're people just like humans.

[Whether he realizes that Ishimaru's thinking of cannibalism or if he just feels the need to clarify, he addresses that issue.]

I wouldn't eat humans though. They'd taste terrible. And because I wouldn't eat them I wouldn't want to kill one, because then I'd be wasting their life. [Injure certain ones, perhaps, but not kill them.]