Harry's eyes turned to the crack. And so did Severus'. And Hermione's. And everyone. Ron gulped as he summoned the courage to look at the opening chasm, as if only this would make it really happening. The floor began to give way as a wan arm pushed through and the rest of a rotting corpse stood to face the people there. Its eyes were glazed and empty, but it could see everyone. Ron's mouth was dry, and he couldn't find his voice. Or his wand. He stumbled backwards as another dead body came up from beneath them, lurching towards the living with only the need to attack and kill.