[deks]

BACK, and to the left... explain “back, and to the left”

It is clearly shown at the link below that Kennedy's head moves forward when hit...as you can see in the Zapruder film, frames 312 to 313 [WARNING - GRAPHIC] . . .

http://www.jfk-online.com/jfk100shot5.html

[Windflier]

Kennedy's head moves forward when hit...as you can see in the Zapruder film

Watch the film carefully. Kennedy's head was already moving in a forward direction (as though he were slumping over from the first shot from behind) when the second bullet hits him in the forehead.

A split second after that happens, his head jerks back violently, which is exactly what you'd expect a human head to do when being penetrated by a high powered round from the front.