I have heard devs talk about wall jumps basically being a double jump, but you can only do it next to a wall. I think H0RSE just over simplified one of the quotes he read.
So yeah, a wall hop. Also know as the tic-tac in Parkour terms. Doing a double tic-tac is possible in game as shown in the run video in the Brink Game Official Website> Features > Freedom of Movement. http://www.brinkthegame.com/features/freedom/ They say that the light can reach places that other the other body types can't, so maybe that the double tic-tac is only available for the light?
Nevermind, I've just read that "the smaller your body type, the higher you can reach." on the mantle part of the video.