System Reference Document

WOUND SHOCK 

Being shot with a big old gun or blown up or hacked with a fireaxe doesn't just hurt. It fucks you up. 

If a character sustains (Strength × 4) points of damage in a single blow from any Attack – after applying any appropriate Damage Cut from worn Armor – they are Stunned. That means they lose their next Combat Turn, having to spend it recovering: picking themselves off the ground, dusting themselves off, picking up whatever they were holding, blinking the blood out of their eyes until they can see and hear again, and so on. 

Giving the nod to realism is not mandatory. The GM is free to classify this as an optional rule and ignore it if the group feels that it makes the game less cinematic, slows things down, makes the game more deadly, or anything else they don't like.