Cerebus, his post said I'm right.
Wolfen, from what I recall, pow choy isn't thrown at a 45 degree angle. If you're in a bow stance, as you pivot on the balls of your feet, you bring your back hand up and over in an arc with your whole arm stretched out and hit then go back the way your arm came- that's pow choy. It's a great way to KO someone or at least really hurt their faces. I've never heard of that technique, we usually used it to smash limbs, i.e., knock kicks down, hit the nose, on the way back uppercut and hit whatever you can.