Let make sure I have this straight before I bother thinking about it:
Climber 1 is unconscious, suspended in mid-rappel, secured by his back-up friction hitch (type is totally irrelevant. hell, it could even be a petzl shunt). anyway, Climber 2 is the rescuer, in mid-rappel on a separate rope carrying the rack. Climber 2 is supposed to rescue both Climber 1.
Are the climbers on single-line or double-line rappels? Also, what is the proximity of climber 1 to climber 2 and the respective ropes of the climbers?