Sometimes it seems to me that the whole dice system is just scripted.
For example, when at the beginning of the game we remove the brain from a half-dead person so that the brain turns into a monster, during this scene dice roll is always higher than the required value.
Several of my characters failed those rolls. If you fail the roll to free it, your are left with the choice to destroy or leave it. If you fail the roll to cripple it, it turns hostile.