More Than Just His Body Changed

He had finally grown up!

Returning to an adult form put Yinsen in a great mood, and since he was feeling good, he conveniently helped Barry solve the problem that bothered him most.

Reverse-Flash had just been sold out by Yinsen!

Although Yinsen exposing Harrison Wells as Reverse-Flash caused plenty of doubt—especially from Caitlin and Cisco. The two of them practically regarded Harrison as family, as an elder, and they simply could not believe that such a wise, kindly mentor could be the villain who had killed Barry's mother.

Yet that was the truth. If Reverse-Flash did not want Yinsen to kill him on the spot, he had no choice but to reveal his powers, thereby exposing his true identity.

Thus, Reverse-Flash could no longer keep pretending. More tragically, he could not even escape, because Yinsen displayed speed and strength no weaker than his own—indeed, even greater—and subdued him with ease.

After capturing Reverse-Flash as thanks for Barry's help, Yinsen left Central City.

He did not merely leave Central City; he directly left the Arrowverse as well.

His greatest goal had already been achieved, so there was no need to remain there and waste time.

As for Thea, Yinsen did not bring her back aboard the Moon Goddess. Although he intended to train her into Diana's Warrior, she was still too immature. Staying there to continue training and improve her strength was a good choice.

Naturally, he left Thea a Multi-functional Terminal. Other than not granting her permission to have Luna teleport her to the Moon Goddess, the Personal Terminal Thea received was no different from those used by everyone else.

Through the Personal Terminal in Thea's possession, Yinsen could continue keeping an eye on both that world and her. Aside from deciding whether to truly bring her in based