Heya!
Man, that was such an embarrassing mistake. I did my research on it, since in the Japanese raw it was called "kicking stone," but I thought maybe there was a technical name for it. I found “hack,” but I mistyped it and assumed it was correct. It’s now fixed. Thank you for the report!
Anna: "A good magic circle is always beautiful. And to me, Lady Grace is the epitome of beauty!" I involuntarily said "aww" outload when I read that. So sweet.
I have seen it mostly in anime's specials and OVAs, the oldest anime I remember seen it is prince of tennis, so I suppose it must be fairly popular in Japan.