People were speculating that those catwalks were temporary for some kind of construction purpose, but I don't agree. At the top of Wonder Woman's lift, there are no guest pathways below. It's just land below that part of WW.
But Railblazer's pre-drop turnaround is right over a guest pathway, and they installed those nets for catching dropped items so they don't knock someone the HELL out below.
I rode it today. What an intense little monster, with some outstanding forces. That first drop and airtime hill in the back is some of the strongest airtime I've ever felt. And it is REALLY well integrated into CGA!