Where one side Sophie was waiting for a chance to strike Elijah.
Elijah was wondering when she would put her cards on the table.
He wasn't naive to take this sudden visit as a friendly visit. Just two people get together to have a drink? Ridiculous.
He still remembered the look on her face that day. She wasn't playing, she was hell-bent on ending his life. She caught him off guard. If not for Marcus to get there on time and knocking her out she might succeed.
Little did he know when found her he set people to pick her sister she was going to snap at him. That explains Marcus' entry. It was for precaution though.
Because he never saw anyone break free of Marcus's mind control. Though he was happy that he took all the safety measures just in case.