Isn't the guide wire also used as a ground?
I started working home construction with my dad at age 14 and it wasn't too long before I started sub-contracting from him doing what was called gyp and deck. Did lots of other things too but that's for another time. Back then gypsum sheathing was used on the outside walls for insulation and water repellent under the brick and was constructed very similar to sheet rock but with a water repellent 'paper' covering and thicker. It was shipped 8' long and 2" wide and was much heavier than sheet rock. The roof decking was either 3/8" plywood or 1x4" strips with the plywood being for composition shingles and the strips spaced 4" for cedar shingles. Anyways, I spent a lot of time on bare frame houses chopping joists that stuck out above the rafters. Yeah, the framers dropped the ball on that but at least most were not sticking up by much so I just used a hatchet to do that job. Over time I got to where I could walk all over a bare frame without thinking much about it but these days, at 72 I don't even want to up on a completed roof anymore....and yeah, I've hit the ground a time or two but was able to get some control of the fall before hitting the ground. I too used to jump off of houses as a kid playing. It was a bit scary the first time though lol.
Fast forward from the mid 60's and 1970 to 84 when my dad and I built my 28x52' shop. Dad was 63 at the time and I was 33.....me being in good shape still but with dad being not as good, he only got up on the top to help me get the ridge board nailed in place and then he got down and never came back up again and now I know why. This was the first time for me to do a complete frame job and it went well with dad cutting rafters etc. The joists were easy and just put up a false wall down the center and laid the joists on it and once everything was tied together, the FW was removed....the shop has no inside support columns as the roof is a semi truss setup. Years before doing this, dad mis-stepped while up on a freshly framed house and ended up falling between a couple of rafters and cracked a few ribs. He never was up on the frame of that many houses and think he didn't like that part at all.
Glad you didn't get injured anymore than you did but man, gotta be more careful as we get older.....and each injury seems to come back to haunt us as we age....