[Sans-Culotte]

I think she was trying to pick up pieces of his head? Kind of tells me the point of impact was from the front.

Not many people have witnessed what Gen. Patton described as "putting your hand into a bunch of goo that a few moments before was your best friend's face". I think that a sheltered debutante like Jackie would likely evacuate the premises forthwith after what she'd witnessed. I do not subscribe to the "picking up pieces of head" scenario. But, you feel free to do so if you wish.

[investigateworld]

Again, I don't claim special knowledge, just what other posters have stated.
I'm now thinking along the lines of B-Chan's comments, "we'll never know".