Audio first began to practice saying the spell before he picked up his wand, forcing himself to think of daisys or something just so he didn't accidently blast one of these first years hands off... you know, just in case.
He started the karate chop motion, laughing a bit, "I feel dumb." he mumbled to his little group.

(OOC:OOPS EDIT)

When he was done practicing and the professor said to try it for real, he looked over to the girls- "Ladies first."