The “turn it off” moment makes sense when you consider what happened to Damon with the Augustine society in S5. He had to leave Enzo behind, and turned his emotions off to hide the pain.
Y'all, this scene is emotional stress for her, because Nina's grandfather actually died in a fire. So when she burns down her house and breaks down, those are her actual tears
I remember seeing this about the scene it brought a lot of memories for her so the crying bit when she is holding the match stick and drops to the floor is actually her saying she couldn’t do it anymore meaning the scene because they done the scene I think more than once so it got to much for and brought back a lot of emotions so if you look closely at the scene you can see the real worry on Candice and Paul faces he looks at Nina and then to the directors for them to do something
Domen doesn't have to tell Elena turn her humanity off all he had to do is tell Elena don't feel the pain anymore over Jeremy being dead then Elena could still keep her humanity on .
You’ve probably found it by now but in case you haven’t, I don’t know the actual name for the song but here is a link to the song it’s titled “Elena turns her humanity off” - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-T8a3pHKYooI.html