Originally Posted by
fumei
Morgan used her Water Mirror, yes, but I'm leaning more towards it not really being an "accident". In the first place, the Water Mirror is specifically used for getting rid of the Calamities (and we know Morgan's plan involved sending the Calamities back in time). The fact that she was preparing to cast it (the "large-scale magecraft" they talk about very early in the chapter) also indicates that she fully intended to use it. However, what's interesting here is that she had already declared that she would abandon Norwich, and this would make sense if you think that she means it in the sense that she'll let Norwich be destroyed, and then send the Calamity away. However, it's weird of her to do that, because it's playing right into Ainsel's prophecy. If she knows the prophecy, and every other time has just sent the Calamity away immediately, why wouldn't she do so this time as well instead of playing into the prophecy that says she'll lose?
And the reason, I think, is because the FC -> QC has to act as one big stable loop, even though the FC consists of multiple smaller loops. This explains why the First Fairy Knight existed in Orkney even before Mashu was sent back in time, since it would have to mean that she also existed in the 2nd loop (the one where Tonelico initially established the QC) but we know she didn't obviously, which means it has to be a stable loop of "Mashu always went back in time and that's why she's there". In that sense, it makes sense that Morgan would be preparing to use the mirror even if she didn't give a shit about Norwich or the Calamity, and for her to play right into the prophecy (though it was changed slightly because of Mashu), because she has to send Mashu back in time, so she waits for Mashu to repel the Calamity and then hits her with the mirror so that the loop remains stable.