"We've got to close in on it! Ron, you come at it from above -- Hermione, stay below and stop it from going down and I'll try and catch it. Right, NOW!"
-- Harry Potter
Harry, Ron, and Hermione mount broomsticks and search through a swarm of flying keys for the one which will unlock the heavy wooden door on the other side of the chamber. They spot it — a silver one with bright blue wings — and corral it with the three of them. Harry, using his skills as a Seeker, swoops in and pins it to the wall. The battered winged key opens the door, then flies back up into the swarm.