[Elsie]

Grappling hooks slide off and no way to grab the top

No need to.

Sling 60' foot long parachute cords with 5# weights on them.

You'd only need 40 to counter balance a 200# person.

Let gravity work for you!

[Elsie]

A small cloth bag (Sock) can hold 5# of sand...

[from occupied ga]

Your method presupposes that there wont be sensors and a patrol won’t arrive. And how does the person get down the other side uninjured. Have you tried throwing a 5 lb weight over a 30 ft barrier? You’d need a arm like a major league pitcher to throw 40 of them. Not saying it’s impossible, but not easy