I have watched other people do it over and over when I am on observer mode. Some use a boost by jumping on the shoulder's of a friend. But some get up there by themselves.

I THINK I am doing what they do, I stand at the same spot and jump but can not get up on the broken windows at all, ever! I try running and jumping too.

Is there some special key combo to jump higher than normal? Or to jump and grab etc??

Please advise