Yeah I think that's kind of the point. When you have a game where anyone can suddenly make themselves immune to all night actions, it kind of allows for more kills. I doubt the poisoner is Mafia aligned, but with the number of third parties we've had, I wouldn't be surprised if it's an SK and the mafia was really small.
Interesting but not surprising. It's not a very good scum power if you end up blocking your own kill. It also meant that you were guaranteed to have one kill go through when you needed it. On the flip side, if it had the limitation when given to you, it's power at night would have been useless. All it would have been good for was telling you that mafia had a way to guarantee that one kill.
Now I have a question for you which you don't have to answer. Are the powers you gain a one off use thing? I don't know if you actually said that already and the "silence" would have to have been a one-off or it would have been really really powerful.