Spinister told him where he stayed. He said the AI could come by if he needed to. And... well. He doesn't really need to. But it can't hurt, right?

It's probably better to go and have some sort of contact before he ends up like he was before.

Knocking is something he's not terribly used to. It should be. He needs to get better at these things. So it's really more of a few taps from his fingers, rather than a knock.