×Beethro walks the mimic north to the end of corridor, turns sword northwest, then steps north and northeast. At that point there's a smacking sound and the mimic dies. A new mimic appears one square southeast of where the old mimic died. The new mimic's sword still points northwest (the right way). However, Beethro says, "What just happened? The mimic is now facing... THE WRONG WAY!"

If Beethro then steps northeast, another mimic appears two squares west of the other. This mimic's sword points southeast (indeed the wrong way). So now I'm left to complete the puzzle with Beethro and the two mimics (the right mimic and the wrong mimic).

×10,7

×Sword is facing S: 22Q3313332