Then I am sorry to say these particular creatures prove a poor opportunity for learning about the mechanics of magic... so to speak. [Sounds like an oxymoron, doesn't it? "Mechanics of magic", hah.]
But if you are at least somewhat familiar with it, that's fortunate. [Explaining things to the "there's no such thing as magic" people gets tedious when Sebastian doesn't know much about magic himself.] For what it's worth, it seems they remain unaffected no matter what the nature of anyone's abilities.