I have to say, i've played through 0.5.1 a couple times...and the thing that sticks out most to me is Argos/Nikos full vent at Asterion after he's revealed himself to the MC and made it clear he wants to help. Like there's such an intense emotional out pour there where you can feel his disgust with the part he's played, the remorse that the Argos is ending, how the MC's compassion affected him, this respect for Asterion in how he changed his prison into a haven, i'd almost say envy for how much the MC cares for him at that point, his anger at the farce of Asterion's punishment, and frustration that Asterion SOMEHOW sees himself as worthless. I think the line that really hit me was "he makes himself low so he can lift you up, and you still think you're nothing but dirt and ash?" Just man, Argos, let it all out. If anything, THAT moment was Argos'/Nikos' greatest moment.
I am really happy someone brought it up because argos is so inelegant and knew from the start that you mc loved asterian. Yes, Astrian had every right to be upset from how he was treated in the past, but when Argos just pours everything and sorta made him fully see how much the mc done for the bull. Going so far to be angry that despite to love and praise you give Asterian. He stayed overly humble, like Argos angrly telling him to love yourself because there are people who generally love him fully.