Sirius and James levitate

James and Sirius had shouted something incomprehensible, and the beams from the headlights had moved.

The policemen wheeled around, then staggered backwards. Three men were flying - actually flying - up the alley on broomsticks - and at the same moment, the police car was rearing up on its back wheels.

Fisher’s knees bucked; he sat down hard; Anderson tripped over Fisher’s legs and fell on top of him, as flump — bang — crunch — they heard the men on brooms slam into the upended car and fall, apparently insensible, to the ground, while broken bits of broomstick clattered down around them.