Well let me explain the relevant bits about my role then.
My goal was to kill everyone.
I had three innate abilities.
The one I used the first night actually creates a copy of the ability for one-time use in another night.
In the second night, I used an ability that let me target any amount of players. Any witch turns into my ally (their goal changes to me surviving, and they die if I get killed), while normal humans turn into Vengeful humans with me as their target.
I used this to target midsummer and Eternalmagician, who were both witches. Since I got shot that sadly just resulted in everyone dying there.
As for why I assumed it was them, I just started out with extra information about the three modifiers (Vengeful, Skeptic, Confrontational) that were present in the game, so I could relatively safely rule out those that claimed them. For thesorceress I was just kind of willing to buy that there was also something to remove them with in the game.
It could have been possible the witches also knew of them and used them to fake claims, but the game was progressing too rapidly for me to not take my chances there. (this technically also only left Battler as the only plausible third option, thinking about it, but his acting was convincing enough for me to not risk it there.)