Initially, Rifindio didn't attack Rean simply because he didn't understand the situation he found himself him. In his eyes, it was Rean who brought him to this place somehow, so attacking straight away wasn't a good idea initially. With Kentucky's appearance, now that thought was completely dropped.
There was a saving grace on his side. His much higher cultivation allowed him to negate some of the bloodline pressure that Kentucky was exuding. And as a Divine Demon Beast himself, he was still much stronger than any Transition Realm expert in Closal Planet. Besides, he had Divine Energy on his side, while the twins only had Spiritual Energy. Kentucky was the only one who still had some Divine Energy in his core, but not much. You could say that Kentucky's bloodline somehow leveled the playfield for both sides, and fighting would bring no benefit to any of them.
