Blade strike, if you have contact with DJI R&D, this would be a great opportunity to suggest to them that they start sending raw IMU data (gyro, accelerometer), raw compass data, and motor outputs, in the telemetry stream. If we had that data available in the .TXT files, we would have a much better idea of what happened here. The .DAT files have that and they're a great addition, but if you crash in water, they are lost...
Already made that suggestion.