After letting in half a dozen goals, most of them scored by Ginny, his technique became wilder and wilder, until he finally punched an oncoming Demelza Robins in the mouth.
“It was an accident, I’m sorry, Demelza, really sorry!” Ron shouted after her as she zigzagged back to the ground, dripping blood everywhere. “I just –”
“Panicked,” Ginny said angrily, landing next to Demelza and examining her fat lip. “You prat, Ron, look at the state of her!”
“I can fix that,” said Harry, landing beside the two girls, pointing his wand at Demelza’s mouth, and saying “Episkey.” “And Ginny, don’t call Ron a prat, you’re not the Captain of this team –”
“Well, you seemed too busy to call him a prat and I thought someone should –”
Harry forced himself not to laugh.

Harry Potter and the Half-Blood Prince – J.K. Rowling