I have to say I read it the same as you, even after I'd read it a second time.
And then we all debated it.
Spoke about why the theory wasn't possible. E.G
The actively bleeding wound. ( I said this )
The damage to the spinal cord. ( You said this )
The pain and confusion after the first shot. (Maggie said this)
That Sheila would have had to fall backwards, didn't have damage to the back of her head. (Caroline)
And then - the theory was never meant that way.

Or am I just dreaming all that conversation?