Fabian, who knew he was probably in the middle of the regular pack of Order flyers but probably at the bottom, or close to, of this pack, was mostly concerned for his dignity. He wanted to look like he knew what he was doing and not aging out of fancy flying. He was overall satisfied with his performance when Remus smashed into the hoop and went overboard.
Abandoning the course, Fabian dropped down to catch Remus before he splattered himself, working the broom with one hand and using "Accio Remus" to at least slow his fall until Fabian could catch up with him. It wasn't managed gracefully, but he caught Remus and bundled him across the room by main force, and then landed without ditching either of them into the dirt of the old Banchory grounds. Mud, actually, from the feel of it under his boots.