Some times a triangle is just hard for some people. I know it well, can teach it well but I rarely tap guys with it. My legs are just too short and thick. Unless he is really skinny in the neck and shoulders, I don't even bother. Right now I am working on variations that might work better. However, I agree about the angle. 90% of the time I see a guy having problems with the triangle it is the angle. Unless you have long legs and real good flexability you won't be able to get the leg across properlt unless you create a good angle.