To answer the original question:
I was an IP in the AH-1G, and regularly practiced TR failures to the ground of three types:
Stuck pedal left (high power; stuck in cruise; and stuck low power. A complete loss of thrust was briefed but not flown.
The IP would block the pedals with his feet, and the PUI would practice a landing using the approved technique, to a full stop. Involved speed control and rolling back the throttle for high thrust, or cutting throttle if low thrust.