There was nothing they could do but stand outside the vault and watch Harry helplessly as Kingsley tried to carefully levitate him towards the cup. There was a Flagrante Curse on the Lestrange's vault that caused objects within to turn white-hot and multiply with heated, worthless copies when touched, which they had only belatedly discovered. Harry's leathers were scorched with burn marks and he hovered unsteadily in the air under Kingsley's spell, reaching out with his wand, trying to hook the cup. The floor of the vault was piled up with white-hot copies of the things he had already touched, and Kingsley was taut with the strain of keeping the Boy-Who-Lived steadily aloft.