"We didn't, but you did," Harry said with a grin. "Rookwood. The others just left him there once he'd been bound in place, you know how they are. I think that might get you out of most of the trouble you're in for not following orders."
Most but not all. It had been their first day and Ron had disobeyed instructions. "I think they guessed that I'd be the first one to step out of line, so you surprised them."