Werewolf part 1

Derek stared in horror as the full moon began to rise before him. “No…” he whispered.
“What’s wrong ?” asked Lisa. “You have to get out of here. Now!” Derek said.
“I d-don’t understand” stammered Lisa.
“You have to listen to me” Derek pleaded “I don’t want you to get hur-NGGHH”  He  collapsed to the ground.
“Oh my gosh, are you oka-” Lisa stopped midsentence.  Derek glared up at her with fierce yellow eyes. “MOVE IT!!” He yelled.
Lisa took a few hesitant steps backward, she was scared now. After one last look at her cringing boyfriend, Lisa darted off into the night.  
Derek shifted himself onto his hands and knees, panting.  He stared, transfixed, as his hands began to change. His fingers thickened and his fingernails jutted out, forming claws.  His teeth sharpened to deadly points and a short layer of fur started to appear across his body.  
I have to get away while I’m still in control, Derek thought.  Standing up, he tried to sprint away from town but was brought back down to Earth as another spasm racked his body.  “Aahhggrrr”  Derek’s scream turned into a growl as his vocal cords altered themselves.  All the muscles in his body tensed as the seizure continued to pin him to the ground.  With every heartbeat his muscles pulsed, growing in size.  His face started to contort, his nose pushing outward and pulling his mouth forward, forming a snout.  His ears became longer and ended in points as they slowly moved to the top of his head.  Sickening cracks echoed throughout the woods as Derek’s bones realigned and thickened.  Then he grew.  His clothes began to tear as he passed six feet.  A loud pop sounded off as his toes broke free of his now tiny shoes.  Then everything quieted.  Looking down, Derek saw that his t-shirt was in shreds and just hanging loose on his torso.  His jeans had ripped to shreds at the bottom and now looked like shorts.   Is it over?
Involuntarily, he suddenly let loose a howl.  Wait, I didn’t mean to do that. Derek tried to move his hand but couldn’t.  He tried to run away, but nothing happened.  The animal was in control.  He could sense everything the animal did as if it was himself, but he couldn’t do anything about it.  This isn’t good. Lifting its head up high, the werewolf sniffed the air and detected a strong scent. Blood.  Where was it coming from?  Sniffing a few more times, the werewolf started to wander east, following the smell.  Wait a minute, thought Derek , that’s where Lisa went!