Eros didn't know where these attackers came from, but he didn't have time to think about that, since he had to take them down quickly before they could inflict any harm on Emily and Zuri.
Zuri seemed to handle the second attacker just fine; it was expected from an ex-warrior from the Shadow Moon pack, but Emily was a different story.
She was not like himself and Zuri, once she got torn up, she would die right away, since she didn't have any healing ability.
Therefore, one wrong move on Zuris' part and she missed the attacker's attack, Emily would die. There was no way she would be able to handle even one blow from a beast.
Moreover, Zuri didn't have any obligation to help him or protect Emily. He didn't know if she was that benevolent, but he didn't want to bet on it.
