The next evening Snape was out walking when Remus Lupin came up to him. Snape yelled at him for being on Hogwarts grounds. "I must see Dumbledor at once, it's urgent." said Lupin. Snape just sneered. Then Lupin noticed that Snape was carrying a bottle of Soul Glo with him. "What's that? Is that a hair care treatment? My hair looks awful! I could really use that." said Lupin. Snape refused to share his Soul Glo, and started walking away. Lupin then tried to steal the bottle. He got a hold of it and Snape pulled, and they had a tug of war. Lupin finally won, and he grinned in glee. Lupin was opening the bottle when Snape bashed him over the head with a rock. Lupin grunted, but as Snape was reaching for the bottle the clouds parted and they saw the full moon. "I forgot my potion!" said Lupin.
Lupin transformed into a werewolf. He still heald the bottle. Snape was furious because he didn't want a werewolf rubbing that treatment on his fur. Snape tried to wrestle the bottle away from Lupin but Lupin slashed Snape and sent him flying backwards to the ground. Snape, agonized, looked up from the ground and saw the werewolf rubbing the treatment into his fur. Snape jumped up in rage and ran to the werewolf. Lupin roared territorily, clutching the Soul Glo out of Snape's reach. "Give me that! Give me that, you foul creature! That treatment isn't to be used for that purpose!" said Snape. But Lupin slashed Snape back down and then he jumped on Snape. Lupin bit his throat. Snape screamed; he knew now that he would become a werewolf.
Lupin ran off into the night holding the Soul Glo. Snape stayed on the ground, crying.