This pic illustrates the orginal design on the Triad HTS. It was later discovered that throw sock #3 could be dropped via a slip knot for limb isolation, which is now included in the triad concept. Though this system works well where flaking line on the ground isn't an option, I personally avoid it, because it's intensive on line management. In the aftermath of a throw all throw socks are repacked with line directly from the canopy. Then they're put back in place for the next throw.
Anyone confused yet?
Regards,
JimK
Keep FIT - Fun In Trees