Ernie glared right back. As much as he wasn't in the mood to deal with Travers, he was hardly afraid of him. But he really wished Travers hadn't witnessed the scene between the boys. It just complicated matters.
"That's not really what I saw, Travers. I saw him," Ernie pointed at the Slytherin boy, "try to hex the Ravenclaw, who was just trying to defend himself. So if you're going to insist on giving the Ravenclaw a detention, then I must insist that the Slytherin boy get one too."
Frankly, Ernie didn't want to have to send either boy to detention. The Slytherin boy certainly deserved a detention, but not the sort that the Carrows were planning these days. Nobody deserved that.