Does dry firing...

I believe so. When there is a pellet in the chamber, there is a limit to how much air can pass the valve and into the chamber/barrel. Without the slug acting as a cork, there is free flowing air that has no resistance as long as the valve is open.

I tried some heavy slugs in a Hatsan QE. It shot them very well, but very slow and not at all usable beyond experiments. I saw over a 100% increase in the shot count.

I support your theory.
 
Dry fire dry fart same thing...

JUST LIKE When you FART NAKED your butt hole has no resistance as compared to when you're fully clothed wearing underwear and jeans.

Dry fire dry fart same thing?

Unless next time when you hold it in too long because of so many people around you don't want everybody to know you farted so not to make a noise or stinky up the room or HAVE A REALLY BAD ACCIDENT (OMG!!! IT WASN'T A FART!!!) THAT MOST CERTAINLY WASNT A DRY FIRE NOW WASNT IT?

https://youtu.be/oSua7TS3ntc