A lead climber is injured and cannot assist in their own descent. The belayer must escape the belay to provide assistance. The first step is to:
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A
Tie a mule knot with an overhand backup to lock off the belay device completely
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B
Call for help and wait for a rescue team before taking any action
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C
Lower the climber immediately to the ground
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D
Unclip the belay device and reattach the rope to the anchor