Merlin, Ernie wanted nothing more than to smack that smirk right off of Ambrose's face. But he knew better. Head Boy or not, he hardly had unlimited authority either, and a fist fight with a member of the IS was too much.
The prat wasn't worth the fallout.
But he couldn't quite keep his mouth shut nonetheless. "I won't run to the Carrows, Travers. The Carrows will be the least of your worries."
Ernie smiled. "But if you don't mind, I was on my way to the library."