You know the situation. Your characters are facing a bunch of goblins you threw in there just to have a combat encounter, because you feel like you should have one here. And what happens? One of those apparently harmless goblins crits and would deal deadly amount of damage to one of the characters. So, what do you do? Well, okay, maybe you didn’t roll the maximum, maybe he just rolled poorly on damage instead…
You know, no-one’s ever going to know…