Snape was silent for a moment -- taking in that information and silently, secretly mourning for whatever children had to fight in a war in a place that was meant to be safe. He wasn't foolish enough to not realize that it wasn't, really -- it never had been, not with the division of Houses or the way that the Professors all turned a blind eye on those children some days (or the fact that he was to blame for that, too) but there was a difference between bullying and Voldemort.
Neville could think whatever he wanted -- so long as he didn't voice his opinions, they were both fine. It was -- a strange thing, though. To be in a place where Voldemort not only didn't matter, but in a time when he was already dead. Snape found himself in a position that he'd never been in before and frankly hadn't ever thought he would be in, a position where he no longer had to live by the rules or lies that he and Dumbledore had set out for him to follow. It was ...
Perhaps too much freedom at once. Severus wasn't sure what to do with it. "I see," he said entirely too long a pause. "I might have more questions later." Which was to say he very much intended to make his leave just now. It was best he take some time alone to think.