Especially in action or horror genres. When you’ve managed to clobber the serial killer/rapist/monster/whatever over the head and he’s laying stretched out on the floor, DO NOT SIMPLY RUN AWAY AND LEAVE HIM FOR DEAD! It only takes a moment to grab something sharp and slash his carotid artery, thus avoiding enormous difficulties later in the story. (You do carry at least a pen knife, right? A responsible adult should no more leave the house without a knife than they would without their keys.)
I’m just saying.
