The Iron Mountain Immortal Tie Da was still yelling at Ji Yuan, "You have dared to take my Divine Philosopher Stone!!! How dare you take my Divine Philosopher Stone!!!"
Ji Yuan had also suddenly realized that he had somehow kept the Divine Philosopher Stone too and he had done so unwillingly.
It was because when he was being attacked by the Iron Mountain Immortal Tie Da when he was trying to take a look at the Divine Philosopher Stone, he had instinctively kept it in his spatial ring in order to focus on his fight.
Accordingly to the laws of cultivations, any items that have an owner's profound signature cannot be taken into a spatial storage that is marked by another as there will be a conflict of profound signature.
That was the reason why Ji Yuan had told the Iron Mountain Immortal Tie Da that it was impossible for him to snatch the Divine Philosopher Stone away from him.