I recall an account of a young nobleman scientist during the French Revolution that decided to do an experiment at his upcoming execution by guillotine, he declared to his friend that he would blink his eyes after the decapitation for as long as he could- the friend documented 13 deliberate blinks of both eyes before the end....
Anyone who thinks death is immediate- meaning the extinguishing of the soul and departure of the life from a person has been watching too much TV. The hard facts is that life is stubborn- and only after the organism is incapable of sustaining life does the soul depart....
It only takes a single instance to learn at the abattoir that even animal life lasts so time after the body is “dead”.
I read an article once about someone who was decapitated in an auto accident, his head and his body ending up several feet apart. Witnesses said the man’s face became horrified as he looked upon his headless body.