Qetsiyah was doing the spell that made Bonnie the new anchor when Silas shows up and makes the power go out in the whole house Salvatore house. When Damon leaves, Elena runs after him saying they need to talk. But it was their hastened wedding in Episode Eight that cemented the depth of their love, as Anna pushed Bates to marry her so she could be his next of kin when he was inevitably arrested for the murder of his insidious wife, Vera. She got it now: It was all a part of his revenge plan that Enzo told him to focus on back in the 50s.
Stefan said he believes Elena makes Damon happy, which means he's not out there killing people.
Elena and Damon
At the hospital the doctors tell him that she is medically healthy and they see no reason why she's not awake. Damon saw her there on a road and mistook her for Katherine. Silas originally wanted to kill Amara anyway so she could find peace. Damon finally finds Elena, and when she gets him alone, she feeds him vervain, and readies to kill him, with Silas' compulsion. This scene is similar to a moment they had in Smells Like Teen Spirit.