It’s possible that the kittens were Conjured, and thus due to fade away in time regardless of what happened to them. I’m not saying that’s what it was, for all we know they had to be real for it to effectively practice Vanishing, but it is possible.
It’s possible that the kittens were Conjured, and thus due to fade away in time regardless of what happened to them. I’m not saying that’s what it was, for all we know they had to be real for it to effectively practice Vanishing, but it is possible.