Seeing Rorie put down the Act 1 boss like that makes me feel bad for going down the sphere grid like I did.
Also the game doesn't really tell you, but the transformation mechanic/aspect of apocalypse doesn't need a full bar to trigger. You can go in and cancel and go back in and cancel again as much as you want as long as you have some meter - which makes it useful to soak damage basically.
nodehtldippin's comments