"I have, actually," Strange explains, as he looks at the basin. And then, without thinking, Strange continues, "We met while you were kidnapped."

There it is, unintentionally bringing up the Matrix again, that elephant in the room and the reason why they were both in the medical tent. They're going to have to talk about it at some point and Strange knows that he's going to have to be the one to bring it up. Childermass is Childermass, after all, he's not going to be the one to do it.

Turning towards the other man, Strange gives him a weak smile. "I set you on fire, you shoot me. I suppose this makes us even?" It's a terrible joke, but it's at least an attempt.