"When the Very High named their skill Forget Love, they meant it literally. With this Very High elder's level of advancement, he must have been very close to quelling all emotions within himself. What could possibly make an elite that had reached such a level so upset?" Han Sen hadn't developed any geno art to such an extreme level of proficiency, so he couldn't understand what that Very High elder must have been thinking. Therefore, he had to risk poisoning himself by intentionally exploring the eye mind. He needed to let himself go and dive into the sadness.
He had been trying his best to fight off the sad mind, so he had only experienced the surface of the emotion. Now that he was letting himself go and allowing his mind to freefall into the sad mind, however, he could understand it at a deeper level.
But the price he had to pay for that understanding was quite scary. In mere moments, suicidal impulses had passed through Han Sen six times.