Nice move, It's probably pretty easy to get on someone who's not expecting the triangle to come from a possible arm bar attack. The pictures were also a nice addition.
why go through all the trouble of tring to get a triangle from head and arm when he straigtens his arm out to stop the key lock thats fine theres an arm bar right there and even faster all you have to do is kick your other leg over his arm and lock youre feet togther when you arch your back to apply the arm bar just push down on his shoulder so it will work other wise if you dont push the shoulder it just pivots his arm and it wont work simple body mechanics