Z-film, JFK Forward Motion @ 230

I'm interested in seeing how the group interprets the following video clip 
that I prepared for discussion. The clip shows frames 223 to 240, 
inclusive, and shows it first in real time, then 50% speed, then 25% 
speed. Each clip repeats 5 times. JFK's very abrupt forward motion begins 
at 230, and concludes at 234. I used the secret service hand- hold bracket

to align each frame.

http://www.youtube.com/watch?v=g-hrPPy6fgI

Respectfully submitted,
~Mark