NTSB: "The private pilot and pilot-rated-passenger, who were occupying the cockpit seats, were fatally injured. An additional two passengers, who were seated in the cabin area, and one individual on the ground sustained serious injuries".
This NTSB report is eye-opening!
A relatively low time [private] pilot trying to teach/explain a [private] pilot-rated-passenger how to fly a jet with PAX onboard.
Obviously the [private] pilot-rated-passenger did not have any systems knowledge and retarded the throttles into the fuel cut-off position.
Wish the PAX would have known the level of incompetence of the pilots, they might have declined boarding in the first place.
A CFII/MEI once stated: a flying aircraft should not be used as a classroom; one should learn the aircraft systems by studying the PTM & AFM and, practice in a simulator over and over again; only then go flying to practice what you have already performed in the sim.