Harry was not oblivious to the unhappy frown being directed his way by Umbridge, but he pretended that he was. Her line of sight was quickly obscured though, as various objects (mostly very heavy looking books) began to soar through the air, though many did not quite go the distance, and tapered off halfway through their journey, and required a second spell to encourage them the rest of the way. With the rest of the class busy, and with Umbridge being ignored in the corner, Harry took the opportunity to the address the Charm’s Professor.