"It is a bit odd that they didn't give you that to start with," Martha agrees. She's not certain they'll come across any spare chains, and even if they did, they could probably be put to better use in some other way. But it's natural to joke around with the Doctor like this.

Of course he tries to tell her that it's fine, that there's nothing she could have done. Martha hadn't even been present, though, as they'd been in different wagons. Maybe if she'd been with him, this wouldn't have happened. He'll be fine once the event's ended, of course, but Martha should have been looking out for him.

She can tell that he means every word, though, and so in the end Martha smiles somberly and nods. "I would give you a hug, but..." She reaches toward him and watches as her hand goes right through his shoulder.