Wow, that is some amazing video! I don't think that I've ever seen an r/c video that was that harrowing, yet not also disastrous. A friend of mine had a take-off experience like that when I was trying to instruct him on how to fly his H9 Corsair. No video of that take-off, though. I told him to "baby the throttle" meaning "move the throttle slowly to avoid engine torque yanking the plane around." He interpreted my "baby the throttle" advice as "don't go above half throttle." He lifted off too quickly and got into a alternating left and right tip stall situation for a few cycles until I suggested that he advance the throttle more to gain some much needed air speed, afterwhich he was able to gain control of the Corsair without damage. I thought he was a goner several times during that take-off just like with your video. Glad that all ended well on both accounts.