[herewulf]

People often ask good follow-up questions when they've gone away to think about the subject and they aren't trying to ask questions on the spot.

[chatmasta]

I don't think OP meant literally "leave the room," but rather "leave space for follow-ups," i.e. don't pack everything into the initial question; keep it vague so that you can ask a follow-up based on the first answer (which could otherwise be constrained by your possibly-wrong framing).

[stray]

L'esprit de l'escalier.