The prospect of the half sphere came to me standing on a walking bridge in Chattanooga TN once. I was only flying deltas at the time so the force issue wasn't a problem. I couldn't figure how to let the lines out and retrieve the kite though. This bridge had an overhead steel structure in the way. An open sky bridge would eliminate that hurdle. I thought it would be lots of fun to be at the zenith and dive straight down 180 degrees (well almost). And be able to fly full circles around the wind window without the ground getting in the way. Hey, I know of a rock outcropping near here that I could stand at the edge of............. Nope, bad idea. I have been pretty good so far to stay out of the sights of natural selection.

With a Delta, hook the lines up to the kite, wrap the lines up with everything connected and simply drop the kite off the bridge while you unwind the lines. To retrieve the kite do the opposite, simply start winding up the lines. Bridge will get fairly clean winds under it, rock ledge, not so good.

And if you're flying a freestyle kite, you can even try doing axels and other tricks.

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One would hope that he's flying a stunt kite or at least a small foil, wouldn't want to be hanging off a bridge with a powered up foil, just asking for it.

There was a death a year or so ago in the UK, dad flying his 3.5m foil in off shore winds about 100ft from some tall bluffs, well long story short, wind got him and his kid watched him get pulled over the edge and out to sea.

I'm not going to offer any other advice here because the other guys have said it all.

What this did remind me of however was seeing an elderly guy turn up at a kite festival on Blackheath Common in London back in the early 90s with an old military parachute... it was a low wind day and he was able to pull it up into the sky and fly it above his head like a giant foil.... bizarre....