What happened is that the FC killed the motors because it thought that it was on the ground.
95.291 : 8465 [L-FMU/FSM]state changed. cur: on ground
95.320 : 8467 [L-FMU/MOTOR] Stop. reason:landing.RC_Thr
95.320 : 8467 [L-FMU/MOTOR]Total start times: 1, time: 95.32
95.320 : 8467 [L-PWM]set actuator mode:IDLE
95.320 : 8467 [L-FLYMODE]CTRL reset all by motor stopped
95.321 : 8467 [L-FMU/FSM]state changed. cur: motor off
95.337 : 8468 [L-IMU]set imu switch level = 1
95.398 : 8471 [L-TAKEOFF]alti: 1801.617188 tors: 91.809647
As for why the FC thought it had landed, the only thing I see is that when you applied full down throttle at 94.4 seconds there was no descent recorded for over 1 second. I thought that it required 3 seconds of no descent to stop the motors, but perhaps not on this firmware.