I don't get it Bolt

[rainy.here]

@W3D

Ok then, why don’t somebody time bolt from reaction (hand time start) to the 40y mark and see what it might be?
Hang on, I will do it soon and post what I get from a best of 3 times.
If it is hand timed then 0.34s could be taken off bolts ET time (iaaf timing rules for events under 100m) to make it a rough 40y (4.01).

How you gonna do that when there aren’t any 40y marks on the track?