It pitches nose up and rolls LEFT on a counterclockwise rotor because the stall occurs past the 9 o'clock position.
Whilst blowback (flapback) resists any increase in speed and has to be overcome with more forward cyclic, it is not the restoring factor in RBS - as the nose pitches up, the relative airflow changes, reducing AoA. Additionally, the reduction in speed caused by the nose up will allow flapforward (assuming nothing is done with the cyclic) to bring the nose down again.