The former is my understanding. Nigel ferried it from NSW not Dave or Armin. Likely Dave was giving him a type rating for it (of course owner would have first go once it hit the hangar) and would not have been in command. Dave drove Tecnams all day but not the tail dragger. It was new and about to become an option for Aerosport. Tail dragger has a much bigger rudder and more pronounced effect. A bit slow, maybe turb or shear knocked them around, given time of day, maybe Armin thought they were overshooting finals and then a bit too much rudder (maybe ok for the nose wheel Tecnam Dave drove all the time), or maybe it before Dave can correct him, or maybe at 80 years he might not have listened, a stall might have been recoverable but not a spin, all over. 9000 hours of experience just like that.