I crashed my P4A+ trying to do a flight like that using manual control. Drone brushed a tree branch overhanging the river and then shut down and fell 60 ft. into some bushes that broke the fall. Just missed falling into the water. Battery flipped out and was lost, and it was my newest best battery. There is no effective obstacle avoidance with the P4 or P4A when flying sideways. The only damage to the drone itself is that it ruptured one of the 4 little silicone rubber vibration absorbers that cushion the gimbal mount from the aircraft frame. I ended up ordering a vibration absorber assembly for under $10 on Amazon. It turned out to be the wrong part for the P4A (it was for the P4) but I was able to take one of the four rubber dingies from the assembly and replace the one that was torn. I have one DJI Care refresh left but 6 months more of coverage, so decided to repair it myself and save the refresh in case I really need it.