I had an interesting thought I wanted to share to see what people think-
The mental image I have of my Beast is that It is locked in a cage with absolutely unbreakable bars, with an unbreakable lock on the door. It can shout and scream all it likes but I won't let it out.
I realised that the mistake here is; Why is there a lock and a door in the first place? That implies the Beast can be let out.
I redesigned the cage, there's no door anymore.