Draco had been too focused on his find to notice the commotion taking place behind him. It was only when Buchannan called for his attention that Draco turned around, seeing the bright blue light emit from Harry’s chest as well. This wasn’t something he had taken into consideration when picking out this particular spell, but it made sense that it would react to the magic lodged in there.<br/>“Right,” he said, flicking his wand in Harry’s direction and watching as the light dimmed and, eventually, died out. He could tell that the others were worried about it, probably uncertain about what exactly Draco had been testing for and he couldn’t exactly blame them for assuming that this was either new or dangerous information that Draco was unearthing.<br/>“The spell I just used helps me locate sources of dark magic,” he explained, his tone unhurried and unbothered, having not exactly expected this outcome, but he also wasn’t entirely surprised by it.<br/>“And seeing as Potter has dark magic lodged in his chest, it is only natural that it reacts to him as well.”