Black Sheds, one might ask about what part of the plane being at fault for providing bad data in the period immediately after the aircraft went to ALT 2 mode. Airspeed was out. "Protections" were out. PF pulled stick up enough to cause a serious zoom climb that left the plane with an "apparent" airspeed of about 215kts. (Assumption here based on airspeed coming back briefly and the number reported being within reasonable bounds for the kinetic energy transferred into potential energy.)
What led the pilot to disregard stall warnings all the way down?
But most of all why did the pilot pull nose up on the plane right after (within a second or two) the AP and ATHR disengaged? He had accurate data up to that moment. And an average kid can extrapolate into the future.... The drill is "leave it alone, fly pitch and power until you have air speed back. Do not make any large sudden changes in either pitch (no nose up) or power (no TOGA)."