Night time. An alley.
Worm's eye view of Henry standing and looking down. He doesn't look super impressed.
1 HENRY: Don't you get it?
Move to show that Henry stands above Mikey. Mikey lies in a pile of garbage on the ground. It's clear that Mikey has been roughed up some: his clothes are ripped and he has minor bruises and cuts.
2 HENRY: As long as you keep disappointing me, I'm going to keep teaching you these lessons.
3 HENRY: So have you learned anything yet?
4 MIKEY: Yeah...
Mikey looks to his side and notices a big piece of pipe lying on the ground near his outstretched hand.
5 MIKEY: I think I have.
Henry reaches down to help Mikey up. Mikey accepts his hand.
6 HENRY: Good. Then let's get out of here.
Back on his feet and still holding Henry's hand, Mikey swings that pipe for all he's worth, smashing Henry in the face. Maybe do this panel in silhouette, leaving the details of the violence to the reader (although feel free to have some blood / teeth flying out of Henry's face).
Mikey looks down at the unconcious / prone Henry, shocked and afraid at what he's just done.
Mike runs off.