You talk about banking.
In a fully developped deep stall, you have no aileron control any more, no rudder or elevator control any more.
All you have left is use assymetrical trust to get the nose to turn, bank, and eventually drop. Usually one wing unstalls first, and you flip past 90° of bank (the cartwheeling part) but you have the nose down.
Regain speed, and regain air movement over you controls.
Regaining speed is regaining airflow over the control surfaces, speed is life.