Peekay4
All the captain had to do, was push the override button to get full control. For that he did not need a DUAL INPUT aural - if he had used the override button, that warning would not have sounded either. The lights, indicating DUAL INPUT through their illumination, were not prioritized away by the STALL STALL aural.
Yes, as ex-Airbus pilot I know that the override button is hardly ever needed, so hardly ever used, but is an essential step to memorize when taking away control from your mate.
In a Boeing, it still takes more force than your mate is applying in order to override him. Will you intuitively know for sure whether you are just applying "unusually large or unusually strong" inputs or whether you are still fighting the other guy?