[ The "willingness to accept a changed form" bit has something tense and unpleasant ghosting over his expression. It might be noticeable to those with honed observation skills, but he won't be drawing any additional attention to it.

In fact, he's quickly forcing his expression into something calmer and moving on: ]

That's an interesting theory... [ interestingly accurate-sounding, so far ] I've encountered several people, so far... But, I didn't get to talk to them long enough to properly form an opinion.

[ That's... technically a lie; while there's nothing unsteady or off about his tone, he's looking down at his phone as he says that last sentence. He's so good at this. ]