Slippery Slope Descent System

Imagine a long hike on a rugged trail that traverses hilly terrain.  It begins to drizzle rain.  Within a short span of time, you no longer have sure footing.  You find yourself judging the risk of sliding and the potential outcome.

This descent system is intended to be light for hiking and provide stability on steep slopes.  The hiker with a full back-pack would definitely appreciate this.

Here's the system:
1.a. Hiker is attached to an aluminum rap-ring* with a Munter hitch.
1.b. A 2nd hiker can be attached, but they will remain locked off.  The weight of the 1.a. hiker prevents the flow of rope through the Munter hitch.
2. Running bowline is cinched around an anchor - like a tree.
3. Thin line rated for climbing(=< 9 mm)
4. Thin unrated line (=<3 mm) to pull down the knot and retrieve the climbing rope

When the first hiker is attached to the rap-ring, they're managing a self-belayed rappel.  The second hiker positioned above experiences their line being locked off.  The weight of the hiker below does that.  This dynamic is commonly referred to as a fireman's belay. When the first hiker is off rope, then second hiker is free to rappel.  The first hiker is in a position to provide a belay by pulling down on the rope.

*rap-ring is a metal ring commonly used for rappels or rigging.