"Oh come on, Mands! You have to know I'm not. Why else would I have dated Weasley and Cho?" Michael was close to whining at Mandy now even though she more then likely couldn't hear him since she was being a dirty, little cheat and taking off without giving him warning that she wanted to race. It was actually probably better that he held off on talking until they were done, actually.
So Michael ran, pushing from his slow starter jog to an actual run as he went to catch up with Mandy. When he was closer behind her he slowed down and contemplated. His first thought had been to tackle her, but he'd easily disregarded that. After all Mandy was one of his female friends and he couldn't be sure how she'd react to something like that or that he wouldn't hurt her. "I'm going to get you, Mandy!" he called out when she turned her head to look at him.