I believe his death was epic. Furiosa isn’t the type of person to lie to boost her ego, let alone to a History Man - the person who is retelling the legend of Dementus’ death.
I left the theater once she knocked him out again. Get to the point we know this is his death, it kept dragging after she was toying with him with the car
Dying of a seizure from blunt force trauma is hardly epic. It's why Furiosa came up with all kinds of stories about his death. Because in real life, final confrontations, final battles, what have you - are hardly ever epic. People just die, and then that's it.
