With superhumans, the acceleration time would be negligible. Likely a similar number to the crossing time. So double the crossing time and you've still only got 2 seconds+ at 100 feet.

Though to also point out something you neglected, human error. With humans not being able to fully resist the recoil, as well as their potential inaccuracy depending on stress level, technique, and training.

Also, you don't have to quote every time you reply to someone. It just makes the thread harder to scroll through.

Edit: Even further I've disproven the 'higher level' point already. Which is what I was trying to get across in the first place. These aren't even intermediate tier characters that are crossing this gap in such a short period of time. These are low tier characters.