Has not and has not needed to, with how rare and typically brief the appearances tend to be. Martel tastes the dragonwhiskey while he decides what to say and when to inevitably change the subject to something less tension-inducing. 'Brittle' is a good word for it, and if he's honest then the fact Severus is not especially good at it (and thus less likely to ask him about how it all makes him feel and express the kind of awkward sympathy that will only make him feel more wretched) had something to do with why he's here and not somewhere else.

That, and they're friends. After a (strange) fashion.

"Far from it. A few, occasionally - Kalten broke my ribs and felt much better for it, but he's a simple sort of a man." There's a bleak sort of humour in that, as well as truth. "Apparently we're not as interesting to the multiverse at large; you wouldn't see me complain about it."