You have a mouth and teeth don't you?

[Shinki can eat all kinds of things!]

... I don't advocate eating other sapient life but there's the tools right there.

[At least it doesn't sound as if Zangetsu has any special adaptions that come from eating people, just a whole lot of enthusiasm when it comes to trying. ... Well, once he got what he wanted out of the relationship they could go their separate ways but until then it was dealing with the lizard guy.]