Who Is Leonid?

It would be easy for Nic and for everyone to think that Elizabeth killed Agatha Teagan out of self-defense especially since she was outnumbered that night. It would be easy for them to think that Elizabeth was kidnapped. But when Nic arrived that night at the scene mere seconds after Elizabeth fired the gun, he knew that it was not the case. If it was self-defense, Agatha Teagan would have been standing in front of Elizabeth, probably on the ground fighting over the gun. There would be signs of a fight. Elizabeth should have that look of terror on her face knowing that she had killed a person accidentally and she was afraid of the consequences. 

But Elizabeth doesn't have that look on her face. She looked cold and aloof. It was as if she had intended for it to happen. As if she finally achieved her goal.

When Tim reviewed the security footage inside Linus Teagan's mansion, they knew that it was not the case.