Everywhere I look says I have to hit all 5 EP level 7 bosses with the Worldline Zero while the boss is unshielded. Well, I've just tried that on the boss, and it didn't do anything. Tried hitting it with a light attack, tried hitting it with a heavy attack, even tried attacking the boss with Tesseract. This boss doesn't have a shield to begin with, so I can't see how that would have been a problem. The boss was eventually killed by my teammates, and even then I didn't progress even a bit on the catalyst. So please, enlighten me, how am I supposed to do this?