Wait a second, if Firebrand could physically reveal himself this whole time, why didn't he do it during the livestream incident and explain what was happening before he sent you?
My guess is that he couldn't, and that Observer fucking with my live stream gave him an opportunity to. I'm thinking there are a lot of limits to their powers, time travel through space and time can't be without impossibilities.
Do you think you know the creature you're facing? Their true nature still hasn't been revealed, the more you do the more they slip.
Go fearless and see.