Page 147 - Bob Holtzman "The Field Guide to Knots How to Identify.."
P. 147
5. To tighten, pull the standing part with one hand, and the bight with the other hand. Be careful not to draw
the working end through the crossing turn when tightening or you’ll be left with a standard Overhand Knot.
Untying: Grab the working end and pull. It may get harder when the end of
the bight reaches the crossing turn, but more effort will usually succeed in
pulling it through, unless the rope is so stiff that it won’t take a tight radius.
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