Parvati walked forward, her face set. Snape rounded on her. There was another crack, and where he had stood was a bloodstained, bandaged mummy; its sightless face was turned to Parvati and it began to walk toward her very slowly, dragging its feet, its stiff arms rising --

"Riddikulus!" cried Parvati.

A bandage unraveled at the mummy's feet; it became entangled, fell face forward, and its head rolled off.

"Seamus!" roared Professor Lupin. Seamus darted past Parvati.

Crack! Where the mummy had been was a woman with floorlength black hair and a skeletal, green-tinged face -- a banshee. She opened her mouth
wide and an unearthly sound filled the room, a long, wailing shriek that
made the hair on Harry's head stand on end -- 'Riddikulus!" shouted

Seamus.

The banshee made a rasping noise and clutched her throat; her voice was gone.

Crack! The banshee turned into a rat, which chased its tail in a circle, then -- crack!- became a rattlesnake, which slithered and writhed before -- crack! -- becoming a single, bloody eyeball.

'It's confused!" shouted Lupin. "We're getting there! Dean!" Dean hurried forward.

Crack! The eyeball became a severed hand, which flipped over and began to creep along the floor like a crab.

"Riddikulus!" yelled Dean.
'There was a snap, and the hand was trapped in a mousetrap. "Excellent! Ron, you next!"