if there is any mechanic related to the coven roles that could have interfered in this situation
never played the DLC
I don't think so. Coven Leader (CL) can't coincide with the witch. This isn't coven so the one who controlled FB is a witch.
So what happened in this situation.
TAC out himself as Escort (if he is town)
If Drago fucked up with the notification that should have been sent to Trissy, then TAC put her in a bad situation that she has to claim. Why?
1. TAC is telling the truth
2. No kills, so RBd players are the best option to claim unless other info is revealed
3. If she claims, then that could be an immune to RB roles otherwise, she will be deemed lying.