What??? I'm not sure what you're talking about, but I am sure that I must have it.
The action is such that the connection between the spool and the bolt pin guide disconnects and reconnects if the bolt encounters to much back force. The spool cycles still, but due to the the position of the bolt the air doesn't leave the valve. Then when the valve resets it reconnects with the bolt.
It is a different take on the anti-chop. You will have almost no ball breaks if tuned right.