Start from the beginning.
1 - The owner keeps talking, but Terence just cranks him right across the jaw, sending his head snapping and his body to the floor. Depending on how you feel, maybe have some blood / teeth flying out of his mouth.
OWNER: Now get out of--!
TERENCE (interrupting): Shut up!
2 - From the owner's prone perspective. Terence straddles his prostrate body and raises the same fist he punched the owner with in panel 1. Unsurprisingly, Terence is not happy. He screams his words.
LETTERING NOTE: Perhaps have the balloons / letters increase in size from panel to panel to indicate Terence is shouting louder and louder?
3 - Same perspective. Terence's fist is down, presumably punching the hell out of the owner. His anger grows.
4 - Same perspective. We're pretty much repeating panel 2, but maybe with a bit more blood on Terence's hand and Terence being a little bit angrier.
5 - Same perspective, but repeating panel 3, as Terence gives another massive punch to the downed owner.
6 - Same perspective, pseudo-repeating panel 4 / 2. Maybe have Terence give slight pause as he realizes something.
TERENCE (trailing off): Shut--
7 - Repeat panel 6, except Terence doesn't look mad anymore. Instead, he looks worried and confused (but mostly worried), as he understands the damage he's caused.
8 - Outside. Terence walks away from the convenience store, which is on fire. The flames burn brightly, clearly well along in their destructive burning. Terence looks haunted by what he's done.