What did I do wrong? While finishing a video survey of some land with abandoned buildings and smoke chimneys I encountered a flyaway condition. I did the full pre-flight including compass dance (calibration), manual takeoff, confirmed home point was set. Fail safe was set at 100 meters, 300 ft for 200 foot smoke stacks. After 10 minutes of flying normally and as expected, 0 wind sunny day, and taping, I climbed to preset ceiling limit 130 meters for wide shot which was confirmed by the voice of the app. Then pressed RTH on RC while at 390 ft..
I1 immediately went into climb, broke through 400 foot limit set earlier. I watched altimeter go up as I1 began to disappear. I tried full down on the stick and no response. At about 830 feet I canceled the RTH command on the app screen (red X with "cancel" over the RTH button). It appeared to drift away when I realized later it was my stick input the wrong way. (Reviewed flight log which I have showing climb right after RTH.) Pressed the RTH on the app for second recall and it thankfully began to descend. I thought it was a goner watching the altimeter race away like a fly away. Not what I expected. Now afraid of fail safes.
Question1) if I set fail safe to 0, on RTH does the bird hold existing altitude and then land? Or 2) does it fly a straight line at a diagonal from the start point in the sky directly down and over to the home point?
Looking for some soap to soak my shorts after this experience while awaiting your answers.