>>725533051
It's basically the concept of a deadblow mallet in arrow form.
When a mostly rigid object collides with another mostly rigid object, it will repeatedly bounce off of the receiving object until it has delivered all of its momentum.
In the case of a deadblow mallet, however, the mallet essentially collide with its own internal materials and dampen the blow, so as not to damage the surface it strikes.
This is extremely counterproductive if you're attempting to create a weapon.
Weapons should be optimized to deliver the maximum amount of their momentum into the target, not fret over the possibility of denting said target.