This trick allows a faster execution of CIA rooftop escape. Just go on the higher box, wait for the guard going left and go down. When Ethan is about to fall, use the bomb. Try to go as close as possible to the right so you don't get caught by the guards but watch out for the laser. So Ethan will keep standing even after he falls and you need to go behind the door and shoot the guards and you can complete the level. It is a little difficult trick but it's just a matter of practice.

Hi I've just found an easier and faster setup for this trick. I did it badly so you can do it faster.