"You left your cloak outside, Granger," Draco said tonelessly, dropping the black bundle deliberately on Ron Weasley's head with more force than necessary "oops! sorry about that, Weasel, didn't notice you, not that you stand out in any way other but because of your hideous hair."
And before Ron can even open his mouth, Draco fires a full body bind curse and Ron freezes in his position, his face contorted in anger and turning purple.
"I better go and look up that reference book for the final Potions paper." Draco nods at Hermione, who, despite herself, grins back, undoing his spell.
Draco barely hears the loud sound of Weasley's angry tirade before turning the corner.
