
Geno cuts through the two Darksides.
One is defeated since it has an actual physical body, but...

Geno: Huh? But I cut it!
Velshyyr: Well, it seems that...ghosts cannot be cut with physical attacks since they have no physical bodies?
That's the only logical explanation for this that I can think of.
Well, you heard it. Physical attacks won't work, so what do you do?