Comment I thought the point of the charge ... (Score 3, Interesting) 42
I thought the point of the charge was to make the "wooly" side-fibers of the strands wrap around the prey's limbs and/or the microscopic irregularities in the exoskeleton, tangling to it. "Tying" the fibers to the prey would have a similar binding effect to gluing them to it, without the need for glue, and lots of little fibers could make a very strong attachment.
(Stretching fibers made of long chains makes them stronger by aligning the chains along the direction of the stretch.)