You could save him, there was still a mere chance.

Seeing the tears of gold and blood flow from Nico's eyes was torturous and painful. The spirit of Hades was by his side, and even he squirmed to see his son suffer so much

"Don't you dare touch the mortal." Nico threatened, even with his wrists gushing blood, seeing the Medusa get so close to you, its teeth sharp as arrows continuing to dig into your flesh was something that took away Nico's control. The scream that escaped his throat made Nico lose his mind. His eyes, and his pupils became coal black.

A scarlet chain formed around the medusa's neck, which made the beast retreat in distress "I warned." Nico mocked with a hoarse voice, just as he scared away Medusa, Hades, surprised and with a certain pride, shrugged his shoulders, and without fear of possible accidents, returned to the underworld, on the other hand, Nico clenched his wrists, still with the blood running down the torso "W-what did I done..?" He questioned himself, afraid of hurting you