He doesn't, not at first. Mostly because for a moment, it seems terribly real. And because it's Q. And he wants...to follow it, like he can insert himself into this memory-fantasy.

But that's not what he's here to do. Bond blinks, tunes it out. Like on a mission. You learn to tune out people, background noise, conversations, to focus on something else, important details, things that--aren't this. It's not slamming it all shut, a vicious pushback, just an ebbing away. He focuses on Q's hands, as an anchor point in reality.