He could roughly guess the reason for that late-stage Divine Infant going insane.
Presumably, with arrogance in his strength, he entered the sect, only to be infected into a Rusted Sword Slave during the battle. Yet he barely maintained some sanity, then slowly left the courtyard, arrived at the Sword Testing Stone, and managed to reverse escape back to the mortal realm, but became mad as a result.
As for himself, if it weren't for his Divine Soul being far superior to a normal late-stage Divine Infant, he might have ended up just like Qiu Baiwei upon entering the courtyard.
This trial was actually not prepared for the Divine Infant Cultivators, but for the Divinity Transformation Cultivators.
He was able to pass because of his strong Divine Soul.
Now that he's passed, Song Yan's gains are quite abundant.
