yeah when you put power thru the chain it locks off the second shock which is used for large hits. so basically you get a fast efficent bike like an AM but can deal with the big stuff.
also watch out for there new AM frame, has the same 2 shock design and function BUT...
it'll be carbon!
One shock is for small bump absorption and the other is a blow off shock for big hits. It means you can run suspension super supple but still have some left for the big hits. Brilliant idea imo.
Havent ridden one yet. When ever I go into the lbs i stare at it. I want to try out that new sus idea. In theroy its great. Check out the website and it will explain via video.