Video explanation
A rocket stays near a fixed height above its plume while the display stand rotates. This illustrates hovering rather than a complete flight-control simulation.
Balancing weight
Vertical hovering requires average upward thrust close to weight. A mismatch produces vertical acceleration.
Exhaust reaction
High-speed exhaust produces an upward reaction, with nozzle pressure also contributing to thrust.
Stability needs feedback
Real hovering measures attitude and velocity and adjusts thrust and direction. Display rotation is a viewing aid, not proof of attitude control.