Okay so I have a theory…
This is just a theory not fact or anything.
So in this gif from Markiplier TV it shows dark wigging out.
Notice how when Dark is calm he has a red aura around him, but when he’s screaming he has the blue aura and if you remember from WKM Celine had a red aura and Damian had a blue one.
So in my mind it looks like Celine is trapping Damian inside and that he wants to break out. Plus in that particular scene from Markiplier TV he’s talking to Wilford, maybe he wants to tell him something that Celine doesn’t approve of.
Idk it’s just a theory someone might have done it already or I’m just late to the party anyway I hope you have a great day.