Hopefully Keith wouldn't trip. The two lower wings hung practically all the way to the ground unless they were being lifted up.

Sephiroth appreciated the backup and did what he could to support Keith. He can see the other is tiring. Sephiroth had high endurance, but when his powers faded out that likely zapped some of that as well. But he pushed himself to keep going, slicing zombies in front of him and to the side. He managed to get one that was about to get Keith, but that distracted him from one coming at him.