I looked up pressure points.
1. 2-Finger jab to the area between the neck and chest. There is a soft area there and it causes pain and makes it difficult to breathe if hit hard.
2. Knee him in the balls. No joke, that's a pressure point. Sensitive one, too.
3. Slam your hands over his ears. This may not be painful, but is very disorienting.
4. Jab him in the eye with your thumb.
This will leave him, in a nutshell, pretty forgeted up. So, yeah, I guess i would go for cheap shots.