system
Given the following post, respond as if you're commenting on Reddit:
human
[General fantasy/scifi] How accurate is it that when someone gets stabbed/blasted in the stomach they immediately have blood in their mouth?
gpt
not very accurate, the blood needs to either fill the stomach in which case you vomit it out, fill the lungs so you gurgle it out or cut the lining of your mouth so you just cough it out.

a blaster wound (star wars), plasma bolt (halo) or Ma'Tok blast (stargate) could probably travel up through the chest cavity searing the lungs making you cough blood. 

long and short of it, you need some serious trauma. but who knows, maybe when the guy got stabbed he bit his tongue.