Acording to the manual you can B- stall all be it hard to do. Or do they mean not possible, but then show you how you do it anyway.
Thanks Clive
3.4.3 B-STALL Executing a B-stall on a Nucleon is very hard due to specific suspension lines location in stabilizers area. To enter a B-stall, simultaneously pull down both B-risers (red tape) by 10 – 15 cm. The canopy will collapse across the entire span along its B-row, the airflow over top surface will break and canopy surface will be decreased. Forward movement will be almost completely stopped. Further pulling B- risers is not advised, as tests have shown it to increase wing instability. If the canopy forms a horseshoe with both wingtips in front of the pilot, gently apply both brakes to recover. To exit a B-stall, the risers should be released in a smooth and decisive manner. On quick and symmetrical releasing B-lines the airflow will be reinstated and the wing will surge forward, returning to normal flight. In In contrast to standard paragliders, in case of Nucleon there is no need to counter this surge with brakes - yet another asset of the reflex profile! CAUTION: See the PARACHUTAL STALL chapter. All rapid descent techniques should be practiced in smooth air and only with sufficient altitude only ! Full stalls and spins are to be avoided as recovery procedures, of the extreme manoeuvres, since irrespective of paraglider type they may have dangerous consequences! BY FAR THE BEST TECHNIQUE IS SAFE AND CORRECT FLYING, SO THAT YOU WILL NEVER NEED TO DESCEND RAPIDLY! 3.5 AEROBATICS Nucleon was not designed to do any aerobatics.