Not sure about snap stalls Ardy , don't know if they are reliable enough to count on , better off staying in control.
Maybe they are just rolling in the oppoosite direction of the turn they came out of (using rudder to get it rolling) close to the point of stall , and the net lag is making it look a bit unusual. Things can appear different to what they are due to the little bit of netlag. Sometimes when you roll with rudder it comes around pretty quickly, almost a snap (in the Hellcat anyway).