Given that you have received the feedback that your action failed, we can rule out a protective action.
Shooting him would be suboptimal, given both his activity and the lack of prior stated scum read over him from you.
Investigating him might make some sense, but if that were the case I'd expect more suspicion from you today.
Given that he was the only target, we can rule out roles that target two players.
So none of the early theories I can come up with look particularly good here.