check out this animated GIF that is looped so you can watch the blunt over and over again.
www.100waves.com/StrikeThreeTed.html
It demonstrates a good take off point. Too many people try to blunt donw in the bottom of the wave. It can work, but you won't get any air.
If you surf around the face of the wave, feeling it out, you will surely find a point at which the wave is the steepest, or has a bit of a crease to help you out.
The first bounce you do/get will be the best one to blunt on. If you bounce twice you will probably be at the bottom of the wave and will have wasted energy. The blunt can work, but won't be as big