Modern paragliders amaze me, in the video I posted the pilot completely luffs the wing at 3:10 (due to upside-down-ness), but it snaps back open almost immediately.....Watched a video of one of Ozone's pilots testing a new beginners' foil, he was deliberately collapsing one half of the wing and then just letting go of the controls, it didn't so much as bat an eyelid.