What is he actually doing?
I mean can you explain the script of jumpbug?
Edgebug is it?
Basically jumpbug means that you fall down on ground(holding your ctrl) and release ctrl button exactly when you hit on ground, you wont take ANY damage from the fall. It's REALLY hard to do and as you can see on the demo the guy is not "good" player so I REALLY doubt that he managed to do it twice on demo legit... Hope you understand that I tried to explain here..
And edgebug means you hit objects corner(wont damage you at all).