Counter strike source Flash boosting and unknown heights

I think the physics engine, and how the levels are built will ahve something todo with this trick, for example NExon has Invisible walls and Height restrictions, while Source can have user created levels without height restrictions Using Garry's MOD

This is not a map build by the ones who made counter strike source i think.

They have been doing trikz for many years and its what they do

And if you watch trough the movie they are doing shit on assult

I use to do that
Not as easy as it looks

It doesn't look easy at all...

Can u flash jump in CA?