The use of mild explosives meant the web-shooters had to be refilled using a special machine between each use, which isn’t really an option mid-swing. So JT instead built seven of the launchers in total, allowing him to wear several of them on a belt and switch between them from swing to swing. That’s easier said than done, however, and after a week spent training at an indoor trampoline facility with lots of soft places to safely fall, JT managed to complete two-and-a-half swings from the building’s metal rafters before landing back on the ground on his feet.
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It might not be as slick as what Tom Holland appears to do in the Marvel movies (most of the time it’s actually a CG stunt double doing the incredible aerial aerobatics) but watching JT do it, and knowing he’s a real human (plus that dramatic landing at the end) makes this creation all the more impressive.