"Bitch!" Harry dove for cover, knowing he had to bide his time while his magical reserve replenished itself from the room's ambient magic. He didn't know what Voldemort had done, but it was obvious now that magic was flowing into the veil, while the mysterious object continued to allow spirits to escape into their world.
He didn't know what was keeping Voldemort from crossing over, but Harry was determined not to let it happen. He'd killed the bastard once, and it was a moment Harry didn't care to recreate. "Why is magic being called here? How can we stop it?" he hissed to his companions, hoping they could hear him about the ghostly wailing and Lestrange's caterwauling.