It is his son down there.
Everyone else is concerned over the decisions of the son of Poseidon, and as much as Hermes likes the boy, he couldn't actually care less about him. When compared to Luke, his precious Luke, Percy Jackson means nothing to him.
But Luke is a pawn in the same game Percy is an unknowing participant in, and there's nothing he can do. Not even advanced knowledge of the future that was chalked out for him could help Hermes save him – there is nothing that he can do but watch, and pray to Zeus that Percy can get through to his son where he himself has failed.
The boy may not have succeeded during their last meeting, but Hermes lives in home. For all that the rest of the gods have branded Luke a traitor, he is still is his son, and the last thing he wants is to see him dead.
He has no choice – he cannot interfere in the game, and truth be told, Luke would not appreciate it if he did. If anything, he would probably only make it worse.
So he does the only thing he can. He waits and watches, and helps Percy where he can. But more than anything, he prays that Luke lives.
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