"Well fortunately," Snape felt that increasingly-familiar sensation of floundering to keep up with the conversational turnings, "I asked him to teach Potions, not to teach Apparation. You should remember, that's handled by the Ministry anyway, not by Hogwarts."
He heaved a mental sigh of relief as the conversation left the previous, rather bewildering territory for more predictable ground. "I'm sure they'll appreciate the attention.
They're not the only ones, said a snide little voice in the back of Snape's mind.
"Anyway, let me know when you're done, and I'll have a house elf show you the way out. Don't attempt to go on your own: you'll certainly get lost. We're in the distant outskirts of the dungeons."