Rapid incapacitation can be achieved indirectly by cerebral hypoxemia resulting from massive bleeding from the heart, the thoracic aorta, or the pulmonary artery.
Damage to other major organs – the lungs, kidneys, liver, spleen – results only in delayed incapacitation.
2 shot shell cartridges, and in a stooped position, pressed the muzzle into the centre of the chest before shooting himself.
The man, now breathing through a gunshot-induced tracheostomy, picked up the shotgun and then walked 136 meters (446 ft) to a hill where he sat down on the slope and loaded the fourth cartridge from the magazine and into the weapon's breech.
The man then removed his shoes and held the gun against his chest with his hands and operated the trigger with his toes.