that quote, written in japanese gave me a little chuckle.
Oni are often known for not being that bright.
an old Oni trap would be a box with a hole in it and when the Oni puts his hand in to get the prize inside he cant get his hand out, not realizing that if he let go of the prize he could easily remove his hand.
so the quote says Oni hand,
but who's mind does he get?? lol