I think the moderators spoil more than the poster in cases where they point out someone spoiled, without blatantly making it obvious that they WERE spoiling. Whether they know they are or not when they post, if they don't say they know this is going to happen, or it happened this way in the manga, then no one who hasn't read it will know it for a spoiler. Until a mod moves it, blocks it or points out the person spoiled. Just my opinion.

~Chris