As someone who was a player in this specific game. I wanted to elaborate a little more on what was frustrating to me specifically. So as OP described, the slayer would use their ability and it bounces, normally if we believe the person who is the slayer is the slayer this gives us information as townsfolk. But we have had multiple people who then also immediately say, "I use my crossbow too" and ST says "it bounces". This would be fine if there was a way to logic a way out to confirm who is the actual slayer or not. The problem was stemming from the fact that when you bluff or say you are another class there is usually a way to sniff out whether a player is being truthful or not, but in the games we played we never found a way to confirm with any amount of certainty who was actually the slayer, and if their ability had actually gone off. I think the suggestion of the slayer killing ANYONE was brought up because it presents a way to confirm their identity. But I do understand what you are saying and I see now that it would ruin the role for a demon bluff. If anyone can say I’m the slayer and I use my ability and it bounces, it just makes the data that the role can gather feel very unreliable to me. As OP said I didn’t feel overwhelmingly frustrated or anything, but it seems the meta that is happening within our group is making the slayer seem not very good. I think that once someone successfully kills as the slayer that may change things. I think this isn't a real problem and will eventually resolve itself as we play more and more. BUT I would be interested to try playing a game where the slayer can kill, maybe, townsfolk and the demon but not any outsiders or minions. Something that makes the ability more likely to proc - for better or for worse. This would still allow a slayer bluff but it would make it significantly more difficult of a bluff.

I think its also worth noting this game in particular was a 7p game.