They ripped through a tapestry and found themselves in a hidden passageway, hurtled along it and came out near their Charms classroom, which they knew was miles from the trophy room.
This comet was named Shoemaker-Levy 9, and it was a very big chunk of frozen ice and rock hurtling through the solar system at 216,000 kilometers per hour.
On it, you come around this bend that's full of trees blocking your view and before you know it you're hurtling down the track at 45 miles per hour toward a thrilling 75 foot loop.
They were in a narrow stone passageway lit with flaming torches. It sloped steeply downward and there were little railway tracks on the floor. Griphook whistled and a small cart came hurtling up the tracks toward them.