If one can believe all these fictional movies and tv series about "seals" and other SF, and some true life accounts, some guys could continue with horrible wounds.

Is it adrenaline? Is it a trained mindset of continuing no matter what? Stubbornness? Or through a selection process certain attributes of some people progress while others are rejected?

I read that SF guys return to a non excited state quicker, brood pressure, heart rate etc. Adrenaline flow retreats quicker. True or not, I don't know.

In history berserker warriors reportedly took massive wounds yet fought hard. Filled with Odin's rage and fury. Afterwards they were weak and limp and easily killed. On their way to Valhalla.

Animals display similar behaviour. Some buffalo die quickly. Others fight on. With similar wounds. People have speculated as to why. The heart or lungs filled with blood at the time, or not?

Regarding the snake bite comments. No doubt about it. If people when wounded give up they might not be saved. If the person fights willfully for life they might. I hope I never need to find out about snake bite. I fear getting bitten KMs away from the house or vehicle. Having to walk a long distance with only a belt and some clothes to use as a compression bandage, tourniquet. How does one control one's heart rate walking 2 kms? A good reason to carry a mobile phone when out and about if it can get a signal.

Rage, adrenalin, stubbornness, mindset all can play a part. No doubt about it in my in my opinion.