HAHAHA, you distance folk are so ignorant in the ways of the sprints.
10.9 on the fly is not fast. That is an 11.5 at BEST. especially if this is hand timed. Make that more like an 11.7-8 . So dumb.
I have seen guys I train with that are 10.8 runners run 10.2's on the fly or with a run in.
Usain bolt recorded 8.7 in a relay split.
hehehe silly distance runners.