So Daffy,
IIRC you stated that you are a Psychiatrist or is it a Proctologist or was it a Physicist? Whatever, put your lasers down and try this. Put your arse behind the wheel of a big early 1960ish American made sedan. Now cruise along around , let's say about 14mph, in first gear. Now take your foot off the accelerator . Get back to us with your results.
You want me to be your proctologist? Are you coming on to me? Sorry, homey don't play that. Re cruising along in 1st gear and letting your foot off the accelerator, isn't that just another form of braking? Greer knew taking his foot off the accelerator in 1st gear would slow down the limo and eventually stall it. Had he pushed in the clutch then the limo would not have slowed down like it did. Nice try tho dufus.
So why did Greer slow down the limo to a near stop at the Turkey Shoot Point, then turn around to watch JFK's head blow up? Where in the SS handbook does it say to slow down at the 1st sign of trouble?