this a new OOB technique?

Instead of the player clipping a la Advanced Cube Mechanics seems like you can essentially peek and shoot portals OOB with the cube drop (if well-positioned). Works on other areas with a similarly thin roof. The black cube is houses the level transition trigger and the crouch save loads clip you in.

Minus my screw ups + long set up, this should save at least a minute in control room. How would this fit in with the categories currently, given control room from there is just a wait sequence?