It is known that Gandalf disguises his voice as a troll in 'The Hobbit'. In the troll argument Gandalf would say something that Tolkien would describe as being said by "a voice". The voice seems to be stalling for time.
I suspect that in the orc argument at the footsteps of Fangorn Forest, which takes place in the Two Towers, Gandalf does this again. There is "a voice" that seems to be in favor of the hobbits.
Reread both parts and tell me what you think. Has anyone else suspected this?