Professor Flitwick was the first to recover, and he quickly sent a Reductor curse at the troll, killing it instantly, and Minerva shot a disarming hex at Quirrell. Quirrell's wand flew into her hand, and she turned to see how Harry was doing. That was almost a fatal mistake on her part. As she turned her back on Quirrell, he rushed at her and shoved her out of the way, Hermione screamed as the crazed professor leapt at Harry. Harry blinked and raised his wand, the wand pushed against Quirrell's chest, and Harry cast the "Wingardium Leviosa" floating spell, hoping to push his attacker away. It had a much more severe effect, though. The spell hit Quirrell's heart, and, because of the energy behind hit, ripped the heart away from the arteries and veins, and he had a massive heart attack, dieing almost instantly.