There was an awful lot of sniffling and sneezing going on at this point, really. The Master had been holding it in, well... masterfully up til now. But as soon as his back was turned and he was far enough away from the others he afforded himself a small wipe of the nose, accompanied by an even smaller snuffling sound. And then immediately realized that River Song had been behind him the entire time. Perfect.

"Don't you have someone to look after?" he rounded on her, aiming to be as patronizingly polite as he possibly could.