What is the purpose of engaging the Inertial Reel Lock during a pilot incapacitation drill?

Engaging the Inertial Reel Lock during a pilot incapacitation drill is crucial as it prevents the incapacitated pilot from falling into the flight controls. This safety mechanism is essential for maintaining control of the aircraft. In the event that a pilot becomes incapacitated, securing them in their seat allows the other pilot or flight crew to operate the aircraft without the risk of a physical interference caused by the incapacitated individual. This action enhances safety and helps to ensure that the plane can be safely managed, preventing additional complications in an already critical situation.