It was easier to help a stranger than it was to help an enemy. And he did that for her. Although he took the inheritance as a price, that didn't change the fact that he saved her life.
He could have taken the inheritance and then killed her if he wanted to. He could have done worse things as well. Instead, he waited there to make sure that she woke up and was safe before leaving.
"I am an Elder of the Great Demon Sect, but does that matter? It doesn't matter which continent you are from. I only kill those that I want to kill," Eren answered.
"Does that mean you don't want to kill me?" Sera asked.
"Not yet at least," Eren replied. "And as long as you don't try to hurt me, I doubt I would even want to kill you."
Sera smiled in response. She didn't ask any more questions. She already had the answers she needed. She could see that he was different from the other Elders. He wasn't biased. For him, everyone was the same.
