The Immortal that was flying above them softly landed in the arena and gestured for the two combatants to come down and join him. Cain gave a meaningful look to Luna, who would be left unattended and unguarded, and the Immortal took out a token from his robes, speaking softly for a moment before the Innkeeper and a small group of other old cultivators joined her beside the ring.
"Hello, little one. How about I explain the rules of this match to you? That big man there wants to take you as his disciple to train you. The rules say that if he can beat your current master, he is more qualified, so he is allowed to do it.
If he loses, your Master will take over the disciples that the other man is currently responsible for. The match only ends if one of them surrenders or dies. Once there is a surrender, the powerful one in the middle of the ring will stop the fight, and force the loser to leave town so that they don't cause trouble for others.