so, should we be worried about the big guy with the huge sword, or should we be worried about the fact Rumia learned how to remove the seal on her own?

Rumia, if what I've seen her do in doujinshii (like swatting aside a master spark) is any indication.

dandan said:
so, should we be worried about the big guy with the huge sword, or should we be worried about the fact Rumia learned how to remove the seal on her own?

Obviously, this guy is the result of her learning to remove the seal on her own, so I'd say both.