You know, you run sideways then hold the crouch but.ton and your character does a leaping roll into prone.
I swear I didn't take that many drugs. But I cannot seem to do that move in my latest campaign mission. I cannot even do it in the Campaign Gunsmith. I can do the crouch-walk-roll-to-prone (walking sideways crouched, then holding the crouch but.ton) but not the one while standing/running.
But when I go to Multiplayer - Characters - Gunsmith I can do both with no problems.
This is what going crazy must feel like...