Just reporting this bcs I don't have seen anyone else with this issue. And also I don't know if it is purposeful or not. So how this works;
1º: Kill ||yellow in the 'castle'|| without luring it.
2º: Go to the the ||Green Mage|| and talk to they.
3º: ||Go to the cinema and 'help cyan' killing it (and take the soul weapon).||
4º: ||Back to the town and get the Yellow's Mask.||
5º: ||Back to the cinema and now Cyan respawn.||
After ||Cyan|| respawn kill they again, but this will just put you in a 'softlock' in front of they. You can open the menu and close to get off of it.