More like it let him abuse the crate bug like the whore he and every other "good" rifleman there is does.
If you stand behind certain objects (most famously the crates on district) you can fire over the top while your hitbox is 99% covered by the crate.
I always thought this to be a feature; would standing and firing over nf walls count as using the crate bug? Because that was really all Harryhoot did with the heavy rifle.
nah thats actually pretty damn weak, has to do with the players sight being on the top of their heads, not their eyes, or something.