"Caught sight of someone out here and thought I'd come see who was daft enough to be flying in this weather," Jamie replied with a grin. It wasn't like he could talk too much. He'd cast an impervious on his clothes and the broom he'd brought with him just in case it was needed. But, his own hair was fairly well slicked to his head just from the walk to the pitch from the castle. "I'm sure I should probably scold you for flying in that position when you could have slipped off, but got to admit I'm mostly just impressed you didn't," he added with a laugh.
Jamie was sure his uncle would have something to say about him just coming out to investigate on his own, not safe, couldn't know it was Sirius, whatever. His father probably would, too. But, Jamie had developed a very precarious balance between paranoia and Gryffindor bravado. It was funny what the application of logic could do in determining that someone flying upside down in the rain was likely more barmy than a threat.
"Wild question to follow up...if you'd fallen, do dogs land on their feet the way cats do?"