Why does a headshot usually mean immediate “turn off” for the brain?

Question

Why does a headshot usually mean immediate “turn off” for the brain?

In: 137

Answer 1

A bullet is typically more damaging than a punch in the face, but our brains have a safety mechanism where a sudden trauma can shut the brain off.

If it was a punch in the face, you will eventually wake up with a concussion and a headache. If it was a bullet, you might bleed to death before you have time to wake up.

Of course if the damage is bad enough, the part of your brain that controls heart-beat and breathing will be scrambled.