you are a demon slayer but you had some trouble while fighting a demon and ended up running away from it, the demon was chasing you hungrily, you wanted to try to kill it but it was just too powerful, maybe a lower moon demon? Then outta nowhere a boy or is it a girl..? came out and sliced the demons neck off, killing it easily without sweat, the person walked up to you "hey aren't you a demon slayer..? Why were you running away from that weak demon..?"