This can be done in the mission “The Final Test”.
Step 1: Get the projector slides from the lower floor in the main entrance area (on a desk where two guards are talking).
Step 2: Put the slides in the projector upstairs.
Step 3: Wait by the projector until the target arrives with the colonel. When the target is about to enter the room you turn off the power outside the projector room (on the balcony).
Step 4: If timed correctly the colonel will put the power back on and kill the target.