From what I've heard even the bubble couldn't have saved him but who knows
I think Killing Kennedy makes this point:
—bad back, Crohn’s disease etc...he wore a back brace
—without the back brace, his body would have been thrust forward and the second shot might have missed him. With it,
he gets the shot and it’s all over.
IIRC though technically I may mean 2nd and 3rd shots
1st: missed
2nd: went through this throat
3rd: exploded right half of his head
...I am reminded of these lines from
Give the People What they Want by the Kinks
When Oswald shot Kennedy, he was insane
But still we watched the reruns again and again
We all sit rapt while the killer takes aim...
“Hey ma there goes a piece of the President’s brain!”