Well, this Aziraphale can also get hurt. And even killed - well, discorporated. And he's more or less seen what happens if he were to do so on the train. But, this time, he seems to have escaped that fate - he isn't sure if every time could be reversible and he doesn't really look forward to new experiences in dying.

"Oh, quite fine, not to worry." And he is, now that he's dry and comfortable. "But I can't say I'd like to repeat that anytime soon."