In all the books, cut scenes, movies etc they're able to communicate with each other. Not once did I hear an Ally say BUR in any cut scene.
So im kinda wondering, whats the point to this? Only thing I can think of is, /say /whisper and /yell trolls. Other than that, not sure why the communication barrier.
Thanks for your answers to this insignificant question that really is at the bottom of the totem pole of importance.