Ok, so we get this scene in the game right.
So, first things first, that the star thing on his head? Yeah, that doesn't appear until this point of the story. Secondly, something does happen to Asterion at this point, something that the labyrinth itself responds to. Strangely enough, if you get that one ending where Argos is trapped in the hotel by himself, you can also see the same star on his head.
So, what does this mean? I'm thinking this may be somewhat related to what Robert says if you talk to him in your free time. He mentions that Asterion has what he calls a "drained chaos and divinity" within him. Since this scene talks about a power growing within him, could it be that some of his original power is coming back to him? And maybe this relates back to the Argos scene because now Argos has been forced to play the part of the minotaur? I don't really know but I think its really interesting. What are some of your ideas about this?