system
Given the following post, respond as if you're commenting on Reddit:
human
[D&D] A halfling monk just critted a red dragon with his fists and killed it. What does that look like?

A 40-lbs humanoid with no weapons or armor critically injures a 60-foot, multi-ton reptile with scales like iron.  

Was there an explosion of energy?  Did he hit in the exact precise nerve point in a gap in the armor or something?
gpt
Jumping into the air the monk slips between scales broken previously from the fight. Hanging onto the torn scale they swing themselves for extra momentum into the wound right before they plunge their hand deep into the flesh using their maximum effort to dig deep and rip out an artery. A spray of blood comes in answer as the monk falls back near where they had leapt. As the last of the dragon's lifeblood pools before the monk the rest of the party finally admits size does not matter.