Compareing what's going on in Posion vs Don't you forget reprised.
Posion is functionally a song to the audience from Angel. It's doubles at the start as him singing to his hell audience but, then singing to him self for the final verse.
Vox and Alastor are singing TO eachouther, with Alastor breaking the 4th wall only once. This is them actively negotiating this situation while Posion is a old dance that's been done 100 times.
Angel is for his part dancing with Val at this point vs Alastor who is being pulled into dancing. I can also compare that to how with Rosie Alastor also dances to her tune.
In Posion Val doesn't give a flying fuck what is in Angel's mind and his heart. He truely only cares that his physical body is present. Vox does care DEEPLY what Alastor thinks. He wants Alastor to think and feel a certain way (even if that way might be fear.) For Val feelings are a means to the ends of geting Angel to do what he wants (as also see this with Val's hot and cold. He doesn't care if Angel comes "home" out of love or fear, just that he dose).
I think some of the comparisons with Posion is ironically there's a level that, that is what Vox wants. Every paralle in with Posion is the way Vox is acting. Like no Vox isn't Val but he wants to be. He wants to care less about what Alastor thinks. He wants. Yes I say Vox cares about what Alastor thinks AND he hurts him that's not a contradiction (I'll elaborate)
Val and Angel's relationship is very simple. Val wants sex and money from Angel. The start of Posion is money (shooting porn) and sex "any way you want me baby" part.
Vox wants that deep relationship he used to have with Alastor. Which isnt simple, you cant just take that and it pisses him off. The anger he has at still being denied the thing he actually wants, Alastors mind even when he's right there inforunt of him that's why he shocks him. See he cares in the scence of will do anything in his power to change Alstors feels not cares as in like a healthy way.
The fact that Vox cares that's what Alastor is using. As far as Vox can tell Al is shrugging off everything he's throwing at him. Al is acting unaffected which is where he reclaims the power in the situation.
Val would be happy by now if he was Vox, if he had Angel trapped in the tower on his string that would be good enough for him. Vox is never satified he always wantd more than he has which here means the thing he wants most is for Alastor to just have a fucking drink with him.
That's it, the one thing he can't force Alastor to do.
Oh and Angel "wish I had something to live for tommrow" vs Alastor "don't you forget you ain't won yet."
Angel is hopeless and Alastor is stubbornly optimistic.