Still waiting for them to explain why they started this.
They started this because they want it established that Damon and Bonnie have something. We may not know what it is, but there’s something there for third parties to pick up on between them.
Even Shane knew that there was something there because he counted on that fact to keep Damon from killing him. “Between the two of us, who do you think she trusts….”
Vaughn had basically been stalking the group and picked up on something between Bamon that he believed he could use to get his way. Out of Elena, Jeremy Stefan, and Damon, Damon was the one that Vaughn felt Bonnie would go to bat for. Thought Damon was the one that would ensure Bonnie’s compliance.
Silas made it a point to tell Damon to stay away from Bonnie after traipsing through his mind and felt the need to warn Damon away from Bonnie. Also factor in that that was the scene that we got to watch play out. That was the scene that was important. We didn’t get the opportunity to see Silas!Damon because his encounter with Stefan mattered very little.
Can I also point out that Bonnie being brainwashed was more important to Damon than rushing inside to tend to Elena who’d just lost her brother. Damon was more concerned with Bonnie’s mental stability than Elena’s.
And Bonnie getting visibly upset that Silas dared to threaten Damon and attempting to say that she wouldn’t let Silas!Alaric hurt him was like pointing an obvious bull’s eye that Bonnie cares for Damon’s well being as well and didn’t take kindly to the thinly veiled threat that he was trying to issue.
"Sounds familiar. Maybe Damon can convince you."
"I won’t let you—"
"Won’t let me what?"
The point of all this is to show that there is something unspoken about Bamon that more than one person outside of the group has been able to pick up on. Including one who actually had physic abilities.