He should leave me alone, but he's insufferably difficult to predict. I can lock the door, anyway.

[No big deal. Ferdinand will leave if the door's locked and he thinks Hubert isn't there. This is a bit of a weird time for Hubert to be back in his room anyway.]

Would you like me to wait outside for a moment? Or would you prefer for me to head back to my room first?

[The latter is probably easier to avoid suspicion, but he'd be lying if he said he'd prefer it. He doesn't ever want to let go of Marianne.]