I usually set up a redirect of sorts at the bas of the tree with a pulley and sling... My 5/8ths pully is cheaper to replace than a porty. Allows for the roper to be more efficient if slack is need or tension is needed as well... they are out of the drop zone.
We use pulleys and an AMP rope grab for simple set ups. Makes for an easy way to release slack for the climber and taking slack in. Can also let slack into the system for targeting a run so to speak, rope man sort of lets it run out a tad just before it hits.
I have used a prussic loop in place of the alpine butterfly so that the targeted landing can be moved if necessary.
Easier than moving the whole line with the alpine in it.
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