I'm wondering how many pounds per square inch (PSI) that thing is putting out to lift a man that high. My guess would be probably at least 50,000?
That's a guess based on having had the pleasure of working in construction one summer about 10 years ago. We were working on the Shoal Lake Aqueduct in Winnipeg, refurbishing concrete. For a couple of nights I was given the duty of water blasting to clean dirt off an excavated culvert to prep it for a reinforcing layer to be poured over top of it.
The water blasting canon I was using was a rotating barrel of about 7 nozzles on the end of a hose carry 10,000 PSI of pressure. I had to gently squeeze the trigger or risk snapping the hose and or end up on my butt. Same goes for releasing trigger, very gently and gradual or risk falling flat on my face. Neither would have been a good scenerio because the the rounded surface I was standing and working on had freshly implanted vertical rebar fully exposed.
It could drill a hole through 10 centimetres of concrete if pointed directly rather than diagonally (ask me how I found out).
The trick of using that thing was to allow myself to begin falling forward as I squeeze the trigger so that by the time full pressure was being forced out I was literally leaning 45º into it balanced on the tips of my toes. I had the fortune (or misfortune) to be selected for the job due to my size and weight (no not a fat old bald guy), well not fat anyway, and bald by choice.
So those water hoses those guys are using must be pushing out at least 50,000 PSI I'm guessing. Other than that I think it would be more fun without the umbilical chord. I saw a video related to this some time back and the instructor was indicating each maneuver is very touchy.