Harry struggled to keep his rage in check as Snape stalked across the room, chiding their work and taking away points whenever possible.
"... that's incorrect, the kappa is more commonly found in Mongolia..." Snape commented nastily as he walked past Mayumi's notes, and with that she snapped.
"Well I'm from Japan, have you ever been to Japan? No." She snarled, scowling. "So shut the hell up I should know this better than you, who is a little kid who don't even know how to let go of a grudge."
She lost them twenty points and got detention, but the rapid color change of Snape's face was plesant enough to make up for it.