and are the transparent armor stands warps or something?
Edit: Ok I googled it, and I found on the minecraft wiki that Herobrine was secretly added in 1.12 and that he places transparent armor stands, and their use is currently unknown.
They can only be seen in spectator mode. Same as Herobrine, he currently does not attack the player, though some witnesses who have seen him in their worlds have suddenly died for no apparent reason, sometimes repeatedly, regardless of their gamemode. There is no death message when that happens.