The additional injuries that a person sustains, makes matters worse.
There is no great mystery, here.
Force was applied to cause Terri's injuries, compounding her --- what anybody's electrolyte imbalance would be by 4 o'clock in the morning --- state of stress.
That's why we call it stress.
That's why there's so much written up about stress.
Just as, if you were to go to a swimming pool and swim 5 miles ... well, you couldn't because you'd be exhausted ... your heart will stop, when exhausted, and some sudden trauma is visited upon you, such as that first failed attempt, too late in your laps, to get air.
In some situations, combat, you may even freeze in place, with no wounds. You could be found situated looking over a log, holding your rifle, when you run out of that last ounce of energy. You could be found, kneeling. You could be found, standing. Frozen. It happens.
People need energy to function, and without it, things stop working.
What fails, are usually the weak points.
A wife subject to a husband's hectoring, and then physical battery, might just be found dead in his arms without anything more than "low electroytes." The scene, tragically romantic.
It's incredible what the body can endure --- if it has had good conditioning.
On the other hand, it's incredible how bodies in good condition, from all appearances, suddenly quit.
Pat Anderson should have talked to a lot of corroners and combat medics, to learn what can happen to you.