Nearly headless Nick passed through what was left of the walls shouting, "Everyone get outside quick!" Everyone was a bit confused but went out anyway. As soon as everyone was stood outside the castle there was a low rumbling noise as large chunks of rubble were rolling and flying back to the castle and it slowly rebuilt itself but with quite a few differences. For a start the astronomy tower was gone and had merged with the largest tower and an arch was reaching out over the lake but only partway across. Also, a large building with a large glass dome on top had sprung up in the rough centre of the forbidden forest and the forest was reduced in density, the flying car landed next to the people and pipped it's horn, the grille stretching into a slight smile. Finally some pillars erupted together in a circle and twisted around as tiles formed a roof and the windows receded.
Everyone was staring at Hogwarts with their jaws practically on the floor.