Zhou Tian believed that, with his own strength, even if he was not the opponent of those living beings, it would not be an easy task for them to capture him. Under such circumstances, if Zhou Tian were unwilling to hand over the Four Divine Weapons, the likelihood of the enemy successfully taking them from him would not be great.
Without the means to take back the Divine Weapons used for Sealing, they naturally wouldn't be able to release the Human Emperor. Thus, no matter how strong the Human Emperor's original strength was or how astounding his potential, once sealed, it was assumed he would no longer pose a threat to Zhou Tian.
Zhou Tian even speculated that after he had sealed the Human Emperor, whether those creatures would still value the Human Emperor as they did now?