[ He cocks his head to the side, considering that there might be more than one meaning, in that case. ]

Something like a test run? A mock battle, or just a scenario?

[ That was as close a description he could come up with, unsure if that's what Sizhui meant. ]

So... you're telling me Dimitri and Byleth were also taken to this... simulation? On another world? How long ago was this?