Its convergence, if you are unaware of what that is during New 52 but before DCyou DC moved from the east coast to the west coast and put out Convergence as a stop gap for the move. In that story multiple multiverse were captured by Brainiac and put on the world. One of the worlds was where Hal Jordan was parallax.
Interestingly enough that version of Hal left and showed up in main continuity where he fought hal before Rebirth. In fact, Parallax Hal should actually still be out there somewhere.