It is apples and oranges.

I am very familiar with firearms though and a graze from a bullet, just breaking skin, is likely the least damaging but highest risk potential for catastrophic outcome if the bullet were to shift/hit anything of structure. I recommend watching the Garand Thumb video below.

I know what a MT bike crash does though, and we see the results of a viscous ear bite. MT crash ear photos posted in reverse graphic order. Weeks apart. The bloody photo was also cleaned up. There was a lot a lot of blood prior.