I may be a little late for this, but I took a crack at this myself.
Z: It appears I was somewhat late for the show.
Z: I wanted to try you out myself, puny Gattsu.
Z: But I don't need the Hawks to become human and defeat you.
Z: You've gotten stronger, branded one. Impressive.
G: What's stopping you? I'm still alive!
Z: Hah... That is enough for today. We both have other things to do for now.
Z: Before you and I can savor the sweet flesh of death, we must remove the small bones which impede us.
Z: You better hurry. That branded girl's in trouble.
As for the bone line, this is the JP version of that line, transcribed from the 2nd video:
小骨/"small bone" is the first word, which is probably where they got it from.