My limited time flying the turbine DC-3 was largely exploring stall characteristics, and slow speed handling. I experienced a number of sudden left wing drops during the stall testing, as well as pitch control forces at very slow speeds less common compared to those of modern aircraft. The ailerons are large, and if deflected much during the approach to stall, will increase drag, and cause a more aggressive wing drop. This pilot appears to have been in the awkward situation that the aircraft was airborne in an nose high attitude which probably prevented acceleration to a safe flying speed, and was too nose high to allow a return to the runway for a normal landing/abort. As roll occurred, there would be a temptation to level the wings with aileron, which would worsen the situation. Yes, the tail should be well up during the mid takeoff roll. The rudder is plenty effective to maintain heading, the tailwheel lock is no longer needed at speeds at which the tail can be lifted.