There was a moment where they all thought about potential equipment failures in their habitat, maybe including the big hopper which they were about to fly out of range of the little hopper, so if something happened to it they were walking back. And swimming back, since that was an ocean-sized body of water between the two points on the map. Or drown; I guess they could just drown. If you were wondering why I was wincing earlier, this would be the reason.