Wait, what? Remus looked with surprise at that. Lucius Malfoy, who he knew always seemed to have a thing against Muggles, had been studying one of their books? He wasn't even sure what to make of the idea, more than a little stunned.

"AH-" get your act together, Lupin. "Right. Let's see how successful this can be. First time, I just want you to deflect it. Second time, try to deflect it right back at me. We'll build up in difficulty."

With that, he would throw a very simple little hex - hair changing.