Something dark grew in the shadows between the trees. A humanoid figure was taking shape that seemed almost like a living shadow. It slowly began to edge forwards, gliding along the ground like a spirit, and with it brought a cold feeling of dread. It was almost as if they were staring at death itself. A living being of pure evil that could snuff them out in hundreds of ways.<br/><br/>The Ron and Hermione edged back a little, but Harry and the Doctor did not. Instead the Doctor began to crack his knuckles and shake out his limbs, as if preparing for a run, whilst staring down the shadow with a small grin.<br/><br/>"Listen here Harry, I'm about to teach you how to defend against the Dark Arts," he said before chuckling a little.<br/><br/>"Doctor, it's You-Know-Who," Harry murmured, eyes narrowed and wand at the ready.<br/><br/>"No it's not Harry. It's an inconsistency. By the logic of this world this forest is an illusion. Scenery created via magic. Beyond the first few trees is nothing but concrete walls and the sky above our heads eventually turned to a plaster ceiling once you get past the magic," the Doctor said before getting onto one knee.<br/><br/>"Now, how you take advantage of an inconsistency is pretty simple. If something is inconsistent, then you have to create a certainty to counter it. In other words, you have to prove that reality is right," the Doctor explained before pointing at the shadow. "If this were the work of something godlike or divine then I would have to prove that this thing in front of us can't exist. Since this is the same figure you encountered last night, I would ask you to retell the story, which would thus prove that this figure was chased off by Firenze before he could do you any harm. This shadow would then disappear, because it would prove that this already happened and thus its existence would be considered a paradox."<br/><br/>The dark figure was reaching out to Harry and the Doctor. Harry began to wince and clutch the lightning scar on his forehead. Pain was exploding inside his brain, as if someone had lodged a burning knife into his forehead. He hissed and clutched at his wand as it shook in his hand.<br/><br/>"But, if this is a simulation, then this inconsistency is a bug brought on by a virus," the Doctor continued. "And do you know what you do when you're computer has a virus, Harry?" The Doctor asked before slapping one hand on the ground and one hand on his head. "You install anti-virus software."<br/><br/>The world suddenly flickered around the five of them and the shadow let out a screech that sounded less like the cry of an evil immortal being and more like the ring of an internet dial up. The shadow flashed in and out of existence, along with the trees that surrounded it, until eventually it evaporated into nothing and the world returned to its original state.<br/><br/>"The winner is Robin!" The Doctor cheered and stood up before clapping her on the back. "Nice going partner. Now, why don't we take a look outside and see what you've won!"