Sadie thought he was crazy even if she knew he wasn't actually crazy. However, there was no way in hell she'd ever just jump off the side of a building for fun and accio her broom to herself. What if, for some odd reason, it didn't come to her? She'd be falling to her death by her own hands. That was part of the reason she was sticking with Wan as much as she could today. If she so much as even suspected that he might pass out or fall, she'd fly up and do her best to catch him. There were a few spells she could try, but seeing as she'd never really used them in her regular day to day life, she was exactly comfortable using them.
When the two of them met up at the base of the Ravenclaw tower, Sadie had her own broom on hand for when she needed to go up and bring him some refreshments. Standing there next to him, instead of craning his neck to the see the top like he was, she was watching over him to make sure he was strong enough to really pull this whole thing off without interference. Wan seemed really skinny, wiry, but skinny. She didn't like that, but she had learned to keep her mouth shut. Sadie would just rescue him if need be. That's all she could do.
Holding onto the handle of her own broom and a basket of snacks and water, she smiled at him. "I'll meet you anywhere along your journey up and if I think you're about to fall, you best believe I'm come up after your ass. Got it?"