The point is, if one creature hypnotizes, and then another can replenish the ranks, how would that look, and who would it affect?
I don't know how that would work. If I knew, I'd be sitting in Nival right now. My job is to suggest a general concept. For example, I'm very drawn to werewolves. I can even clearly see how they should look and behave. If you have a ready-made, well-developed race, suggest it.