"The Thief's Downfall," Kingsley said and Ron said, "oh fu-" And then the seats flipped down and they plummeted downwards. Hermione screamed until she thought her head was going to split open, legs kicking uselessly beneath her, and arms flailing as she dropped like a stone towards the rapidly approaching ground. And then she realised she had her wand in her hand and with seconds to spare flashed it around, and her and the others" descents suddenly slowed. Someone else must have cast the same charm too, because a second later their descent slowed again to a slow drift, and then they were floating gently down to the ground.