[ That's very like John, enough so that it twigs Harold into not pressing his gratitude further. Saying it once is enough. He isn't the effusive sort in any case; he shows his generosity and appreciation through actions, not words, and he's patient in waiting for the right opportunity. It's shuffled away for further consideration, when he can make an appropriate gesture that is respectful of the recipient's clear aversion to sentimentality. ]

No, thank you, [ he answers quite properly, still trying to catch his breath. ] I can't imagine inhaling a carcinogen after that escapade.

[ There certainly is some bite in there when he's not actively in fear for his life. ]

Your teleportation ability is rather remarkable. You seem quite practiced at it. [ This is his courteous way of fishing for more information, though he is sincerely impressed by it, having never been exposed to anything like it before. ]