Initiating a maneouvre at too low an altitude, with too low an airspeed, and too little power on the way up, then a failure to abandon the display program when it became obvious that something had gone very wrong.
You missed "why did a highly experienced display pilot initiate the manoeuvre a mile or so too early and go completely off his planned axis?"
I'm sure there's a video on the Tube of You showing the same pilot flying the same display in the same aeroplane a week or two earlier elsewhere. It may be worth a comparison.