He cleans your clock so hard that your consciousness is flung into a surprisingly accurate depiction of a relevant memory. You don't know the details of his wacky time-bending fist's properties, but you can assume this is the closest he can get to punching you into the next fiscal quarter.
Looks like you're remembering the first time you ever got an artifact, quite a few sessions back. One of these multifaceted skeletal brats handed you a VIEWMASTER that they bought off of a talking pig or something.
You're a little hazy on the details. The whole system was busted, then.