The easiest exit was gone, though it also provided some light. Barty silently moved back a slight distance to be away from the flames. And he then moved to try to trap his target between himself and the flames, though of course invisibility made it much harder to know for sure. But Barty cast a wide enough net. Difficult game it was. Casting a small charm that sounded like footsteps, Barty sent it right along a bookcase that made it hard to see the light, but the sound kept going.