Hard to believe that someone flying an airplane with 11 skydivers would be inexperienced enough to make a mistake this seemingly basic.
Sadly, it’s pretty easy to believe. Low time pilot gets his commercial rating, no instrument, no multi, and works hauling skydivers to build time. The commercial requirements are pretty minimal, 250 hours, written, check ride.
Hard to know how well they were trained. Harder still to know how a person responds under pressure.
Lots of people seem fine, and say all the right things, but under pressure, when the adrenaline spikes (and it was spiked on this day, I am certain), they do something completely different.
It’s the fight/flight response. Amygdala hijack. When the adrenaline hits, people freeze, or act out of instinct. Frontal cortex activity is reduced. Auditory exclusion takes place. Tunnel vision. Increased heart rate and respiration. Increased muscle strength.
Great for our ancient ancestors facing a Sabre-tooth tiger, not so great in a complex, technical environment, particularly the frontal cortex function loss.
This is what makes simulator training so valuable. You can create all the stress of a situation like this engine failure. Over and over. Pilots become de-sensitized to it. They learn to respond correctly. They overcome the Amygdala hijack.
But you generally don’t get simulator training at the experience level of this pilot, or as part of the commercial pilot track, until your at an airline that can afford simulators.