The Dementor did not cease in its hunt for me. The wave of magic disrupted Death's magic from affecting me, giving me a momentary peace. When the magical arc hit the Dementor, the most terrifying screech bounced against the walls of the room. Everyone in the room covered their ears, mine included, as the blade's magic ripped the Dementor apart. Blue, gold and white light coursed through the Dementor as the cloak and shadow started to evaporate on the spot. The arc would only continue for a couple of meters after that, not being a threat to those near the entrance. 