>>1901887this but not that spear
you want a blade with a good backstop like pic related
if a boar or bear charges and you try to stop the momentum with a spear the animal tends to just run right up the shaft with the head going clean through
you wounded the animal but now its wounded angry and in your face
for this reason the boar spear was developed with a catch bar behind the head to stop shaft penetration allowing one to keep the prey at a distance