The two Lifeslings I have use "D" Rings that are stitched into webbing that goes around the person in the water under their arms and is part of the flotation - you hook into the D Rings with the Block and tackle to lift the person out of the water.
The floating line is not intended to be used as a lifting device but only to get the person up to the boat. Your floating retrieval line should be threaded through the D Rings.
Maybe Lifesling has changed the way it is built - I find that hard to believe on this part. The instructor should have know the proper use.
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