And this is why, before he asks Clint to go, he's asking about stopping.

"If he couldn't be bothered to teach you something else, it served him right." Probably, anyway, given that he had no intention of getting slammed into because Clint couldn't stop. "Toes together in an A-shape is your stop. Wall if that doesn't work, now show me how good you are at going."

...It would get more fun, he promised.