No, it was the beige Mino, who instructs about fighting at the beginning - but it worked the second time, so I thought it might have maybe just been a "glitch" from the WINE-layer.
Unfortunately, when I went back to the room where I was falling into through the trap-door, the game crashed again and haven't played again from there yet (will there be a Save-Option at some point, so we don't need to always start again from the very beginning?).