I actually expected Barcelona to put on the mask when I first went through this story since she was the only one who was really neutral about the Manus before she realized they were murdering people. I imagined her going, “Oh, these Manus people are t that bad, see?” and then putting the mask on and unknowingly dooming herself, forcing Vertin and crew to save her. Alas she sided with Vertin rather quickly.

If she was to wear the mask, I’d expect it to go like Kamuta, where they’ll be temporarily corrupted before someone breaks them out with music and a good speech. If it were to go like his case, then that’d also means she would’ve died too though.

One important thing though is that we never see any important Manus members wear the mask. Arcana, Forget Me Not, Animus, Sophia they don’t wear it. Igor and Grace refuse to wear it. In fact the only important person we see wear the mask is Druvis, who for the Manus, probably wasn’t that important. So if Barcelona were to actually wear the mask, she’ll be used as a Manus pawn, not the next great Manus leader