Initial reports are always lacking. I think just one person failed to wear the safety belt. This is an upward opening plexiglass canopy, with enough weight of the individual and force, say from zero g maneuvering, an unbelted passenger could float into the plexiglass canopy forcing it open (or smashing. The glass out altogether) then there is only a lot of air molecules between him and the almighty.
Not sure how that happened to be honest, but 2 went up and 1 returned sans canopy
I call shenanigans
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