Ok, day 1 - maiden flight of my H pro - crashed Calibrated Adequate Satellite (controller and H) Set to Angle, all left side toggles up, Legs still down, obstacle avoidance toggle pulled down Movement testing in Angle with legs down. On my regular H, obstacle avoidance did not work when the legs were down, but it seemed to work on the H pro. Obstacle avoidance was working with the legs down, I could not push forward to make it run into a tree. It was about 18 feet in front of me. All of a sudden, at maybe 11 feet high, it moved about 2 feet closer to me and started to attempt a landing, except that it was shaking left and right - bobbling all the way to the ground (props still turning), and landed on one of it's legs, and broke a leg (no visible damage, but the legs will not respond anymore. What the h&&^ happened. I have never experienced anything like that with my last H. It is as if it had a mind of it's own, and tried to land while in angle mode. I called Yuneec, and they said they would send me return instructions by email, but so far, I have not seen the email. Please advise if you know what could have caused this destructive event.