Girl she was getting ganged up on and those people aren't your ordinary assasins
The rest of the frozen heroes realize at some point after Junho woke them up that things are much more different and they need to train harder than ever especially after they realized how Junho is going to - so we'll probably get a training montage at some point and the other heroes will go their own ways for a bit to get stronger on their own
(this actually happened in the novel I mean, so we can expect something like this in the manhwa in the next 20 or so chapters)
she's kinda weak. the build up about her magic seems not worth it.