The wand dropped from Remus' hand, and Pettigrew wasted no time in leaping upon it.
"No!" Harry cried, but it was too late. He then flashed his own wand, crying out, "Expelliarmus!" Remus' wand flew from his fingers, as he froze in place - and then he turned, hideous grin as he transformed himself. Harry watched in horror as the rat scurried off into the night.