(gives his fist a faintly disgusted look) ...Because if you're going to lose the wand anyway, you may as well not get blasted across the room. Alternately, if you're going to be blasted across the room, it's better if the wand is already there when you land. Accio appropriate stick. (breaks a couple of twigs off of and tosses him a stick that, while reasonably straight and Hagrid-hand-sized, is clearly not a wand) Show me something.
'Oh' is right. (changes the subject back) Only it's not oh, it's oo. Try again.
(stares at him) Maybe if you're casting in Arabic. (gives him a one-two count to let that sink in) In a word of more than two syllables, what determines if the stress is on the second- or third-to-last syllable, as a guideline?