He was not doomed from the point when he opened the throttle for takeoff because at any time up until lift off he could have closed the throttle and aborted the takeoff and stopped. Having got airborne it looks like he was not going to make it over the trees so he had to keep the speed back to do the tightest turn he could but was unable to turn inside the tree line. It looked like he had a lot of flap for takeoff. I wonder if that might have been full flap and if the flaps were at the same position when it caught the trees or if he had been retracting the flaps. I think whatever he tried he was not going to make it. Such a pity he started his takeoff roll from the point he did and did not backtrack to give himself a greater stretch of water. Easy with the benefit of hindsight.