Michael had picked up on Nakir's scent. He tried to stay in the shadows, he had seen that his whole demeanor had changed but Michael had heard it too. The soft whisper that was floating in a breeze that did not exist.
So that is why Thoth had said they should not communicate like that because it was noticeable through Hell. Any demon would be able to pick it up in the a jiffy. He saw Nakir exit a room, he had a curious look on his face and it looked like if he was making his way towards...
Michael had already worked out the laying of the palace so he had already knew where the rooms where and which was Gadrial. If he was making his way towards her room then that meant, he knew who the voice belonged too.
Michael gritted his teeth, 'Stupid Uriel! You are going to make a big mess out of this.'