Ron looks like he has someone specific in mind while he points his wand. Check him out for the last time in Harry Potter and the Deathly Hallows Part 2.
Malfoy: Why so tense, Potter? My father and I have a bet, you see. See, I don't think you're going to last ten minutes in this tournament. He disagrees. He thinks you won't last five! Harry: I don't give a damn what your father thinks, Malfoy! He's vile and cruel, and you're just pathetic!