To live in the Gallows is to become passingly familiar with the routines of the other occupants of the towers. There's always an element of variation, allowing for missions and misadventure, but if there's someone in particular being sought out, it's not impossible to have a general sense of their comings and goings.

Ergo, John has a sense of about the time he'll find Marcus returning to the stables towards the end of the day. Yes, John knows about the combat training sessions. No, he isn't inclined to join them. That's not what this is about.

"I think it's time we spoke."