Agreement
"Well, I'm not going to help in your argument. But for now, you can take care of them. After all, they're much safer with you and Hel instead of the War God Family." Theo explained.
"That's true. Those people will be trying to use his hearing to their advantage." Loki nodded in agreement. He knew what kind of power the enhanced hearing was. Lyrventh was extremely useful as a spy or a lie detector. When they discovered that talent, he would be used by them, especially since they had a hostage, Lydia.
Lyrventh might know about their scheme, but the enemies could use messages instead of verbal communication. And with that ability, Lyrventh would be called a monster by normal humans.
They feared that ability after all.
So, it was better to leave them in Loki and Hel's hands. At the very least, they wanted to teach the kids a bit more about their power. And these two seemed to have no intention of taking advantage of their talent.