Kirk takes a breathe. He can tell that this man hasn't listened to a thing. Like some cadets, perhaps. So maybe he needs to try treating the man like a cadet. A raw one.

So Kirk gets calmer.

"Doors disappear here. The techonology that runs this place can do that, just as it grabbed you and me and everyone else here from a variety of times and places. I know that does sond impossible - especially if you're from a lower technology world or era - but it's true. And it's no joke."