Very low battery, low enough that it was on it's way back whether I wanted it to or not. In the first second of the clip you can see a bird flash past, seconds later the mini takes a wobble but stabilises, manages to fly back and flew fine for another 20 minutes with a new battery. Airdata's log summary shows nothing untoward at this time. At the very time it happened, I was looking at the phone to check the battery level. I saw the wobble on the phone downlink, looked up and saw a bird flying off in the distance. No obvious marks on the mini.
The shadows you see as it wobbles are probably the PGYTech gimbal/lens protector.
The shadows you see as it wobbles are probably the PGYTech gimbal/lens protector.