Thor wants to reassure him that he's okay, that they're safe out here, but eventually they're going to go back to the inn and he won't feel that way even despite his best assurances. Likewise, Thor could tell Tony he would protect him, but there were no guarantees Thor would or could be when he needed him.

There was nothing quite like knowing you could take care of yourself. And there we're few things harder to accept that you couldn't.

"We can fix the suit," Thor says. It's something that he can day with absolute confidence. Tony was a genius. Jane had told him Tony's story over coffee one morning. That he had been captured and had saved himself and escaped by his own ingenuity.

Tony can do it again. Thor is sure of it.

"You tell me what you need and I will find it."