Their forum, their rules -- but I'm not a fan of perma-banning someone who apparently hadn't broken any rules of the forum.

I'd have been curious to know -- which came first, the collar or the killings? Did Hermione kill three people in self-defense or in an attempt to escape, or was she made a slave as punishment for accidentally killing three people?

If it's the latter, there's potential for some world-building discussion in the prompt.