Challenge: Wikipedia (William C. Van Buskirk)
Word Count: 100
"What have you done to yourself now?" exclaimed Poppy Pomfrey. She bustled over to the examining table as Snape, snarling, limped away from the prefects who had escorted him up from the quidditch pitch. "I knew this was going to happen, refereeing at your - "
"If you say 'age,' your life will not be worth living," Snape muttered. The mutter became a yelp as she probed his hip.
"Level of fitness," said Poppy. "Really, Severus. I've shared Van Buskirk's theories on biomechanics with you. A Wronski feint?"
"I was following Potter!"
"You should know better!"
He groaned. "Perhaps."