1. Put a prussik on your end of the rope, above the belay device.
2. Clip a sling to it.
3. Stand in the sling and get your partner to bounce a bit to get some slack back. Lock off the belay device above the knot.
4. Untie the knot.
5. Now, get everyone else to assemble their bouldering pads below your mate.
6. Let go the belay device, shouting BELOW!!
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