you cant assume the a/c stalled
some years ago a Miami based commuter (CRJ??) flew through CB over Freeport, Bahama. The crew lacked cold weather operations and neglected to turn on the a/c heats. According to reports the a/c tail accumulated substantial amount of ice resulting in the a/c tumbling tail over nose several times. The crew was able to regain control of the a/c only to have the a/c tumble once again tail over nose several times. The crew regained control and landed safely. What did ATC observe on their screen that day?
Was the Airasia pressure vessel compromised at high altitude? if so could the crew don their mask? other factors -30/-40 degree temps, spin, inverted spin, inverted a/c etc