She can do this

Edwin was pacing impatiently in the room in which the Siren girls had given him to stay. He didn't know what to do from now on. Should he have to go back to the Highland and be a double agent?! Or should he have to stay here and pledge his allegiance to Silver Shadow?!

"You should go now," a dark voice said behind him and made him jump. He turned and saw his ex-mortal enemy frowning at him. How did he even appear here out of nowhere?! 'Well, Sirens can teleport,' he sighed to himself. 

"If you stay here any longer, then Oberon will get suspicious of you."

Edwin wasn't actually a fan of being here. He didn't like seeing Silver Shadow, even after knowing that he was on the good side. And whenever he saw her with Celestia, it hurt his heart. Yet, he was scared of facing Oberon, the Shadow Lord. So he was making up his mind to stay here.