[He's working back up to his feet, chin and cheek bleeding from where he hit the pavement and gravel stuck to his hands, when Dirk speaks up. He didn't hear him at all, and the cane whipping back and forth a couple of times shows that.]

Who the fuck are you? You the one behind this prank?! Just wait till I tell the professor, you little fuck, you won't be pranking me again! Now give back my visor before I beat the shit outta you with my cane!