fart sound?

Ok I swear I am not halluncinating, but some time when I play and I shoot one of the guard in brown uniforms they fart.

I can still hear the scream, but I think if you are close to them as they fall over like runnign past them to get their ammo clip you can hear a distinct fart sound.

So the whole thing soundscape sounds like this:

DOOR OPENS
"HALT!"
BANG BANG BANG!
"ARRRRGH!"
FARTSOUND