Because since you went home to your little world you've forgotten just how weak you really are didn't you you little shit.

[Freaking humans. You go home for just a LITTLE while and already you think you're tough shit don't you, Kazuma. It's okay. Envy will just remind you how far BELOW a homunculus you really are. You'll be back to your old sniveling worthless self in no time.]

It's alright. [And without warning, Envy is going to do a swift kick at Kazumas face.] I'll just remind you!