Take the nitroglycerine out of your pack (you can tell it's explosive by the bright green colour). Expose it to sunlight, then hurl it downwards at just the right instant, so it ignites just as it hits the rock face below them. The resulting explosion will propel your partner upwards, whereby you can catch them on the way past.
Side benefit 1: the loud noise might wake him/her up.
Side benefit 2: loud explosions will attract the authorities and resultant rescue services.
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