Fallen
Eve had barely fallen when they returned. The light signaling their return blasted out of the sky, giving off a residue of darkness in it's wake. It had taken quite a bit of energy on his part to even see Thor off in the first place, just weeks ago, and already he had returned.
Odin had no need of his eyes to know Loki was with him.
He lifted Gungnir and allowed it's base to strike the golden floor, ringing out for all of Asgard to hear, to know. Hear there was audience, and here he would have it. Thor would know to come here first, to the throne room. To the hall of his fathers before him, Valaskjálf. Thor would command this hall one day. Not now, but soon enough.
Considering how he handled Loki today, Odin would see if he had learned yet more in his journey.