Loss of control
Loss of control was purely from flying too slow.
Co pilot was calling “speed” which indicated that he thought the captain had the wrong priority.
Captain was flying a pitch attitude that meant speed was decreasing.
Centre of lift moves forward until elevons cannot stop the pitch up and the aircraft “flips”.
Had two delta model aircraft that did the same...both unstable in pitch at low speed.
If he had flown as low as possible he would have delayed the crash but it was probably inevitable from the time he decided to prematurely get into the air but at least he would have crashed in control.