Love what the show is doing with Grover. He is a representation of hope and the importance of friendship, both in his speech to Clarisse and the way Annabeth sees him as a mediator in her siren hallucination. He marks safety as a saytr, finding places that are okay to rest and doing all he can to protect Clarisse to the extent he forgets to don his veil again in time for Polyphemus’ return. He knows his friends are alive because he cares for them so much he feels their presence. Grover cares for all the creatures around him and right now he is very afraid.