Here is an innovative Triangle finish by 17 year old Jared Fisher of 10th Planet Omaha. With only one year of training this kid has won tournaments competing in the advanced division.
The Body Lock that he uses to secure and finish the Triangle does three things. First, it cinches up the Triangle super tight because of the perpendicular angle. Second, it prevents the person from gaining posture or stepping the leg over to counter. And third, the perpendicular angle makes it very hard for your opponent to pick you up for the slam even if they could posture up.