One of the skydivers in this group had a premature opening while sit flying, which came very close to hitting another jumper above him.
It's hard to tell if the jumper above bailed onto his back to avoid the premature opening or just lucky timing for break-off. Either way, this was way too close and could've ended badly.
Here's what the jumper had to say about his gear and the incident:
The rig was modified to be freefly-friendly by the manufacturer, and it had a brand new BOC.
The main canopy was the smallest size possible that would fit into that container, which might have made the BOC too loose and caused the premature opening.
The rig has since been sold to a belly flyer.