[Vastra looks almost indignant, and draws herself straight up. She's almost forgotten what it's like to be completely rebuffed, even though she's almost certain that her opinion of the situation is the correct one. Clearly the cold was rattling this man's mind, or he was just this rude on a consistent basis.] And American, by the sound of you.

[She frowns and keeps walking, holding the furs around her and trying to convince herself that if the mammal wanted to freeze, that was his choice. She'd done everything she could.]

...Vastra. And I wouldn't call arguing with you 'hot air'. I am familiar with your physiology, you will die if you remain exposed for very long. [She pulls the coat into her tighter to indicate it.] This is only preventing me from hibernation.