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You slip and fall but miraculously you manage to hang on to the invisible beam. Your legs are stinging (lose 2 ENDURANCE points) but you ignore the pain, concentrating all your effort on swinging them back onto the beam. Just as you succeed, the crack of the whip resounds once more and burns its mark across your back (lose another ENDURANCE point).
When the whip cracks a third time it cuts only air, for you have crawled out of range of its cruel bite.