So basically the heavy here from red had enough of getting backstabbed instead engineer sees another member for red but as you can see heavy had his sanity gone well,he putted knife on himself alot of times,till he becomes a chaotic killer of desth,basically this has lore because the heavy can grow each kill he does.
Ngl watching the original was terrifying heavydudny has too be the creepiest because he seems to be the only one with animation and is actually shown in the game but idk of other creepy pastas. Reason why I'm afraid is because not only is he immortal he also shows no mercy the reason he did this is because they killed scout with no mercy and scout couldn't reapawn because the respawn machine was turned off