User blog comment:Darkcloud1111/''The Mark of Athena'' Plot Holes/@comment-3146930-20121011002344/@comment-208.102.160.125-20121015234130

On HYPERBOREAN'S comment, monsters are never destroyed. They just sort of get teleported to Tartarus, and wait a bit til they're strong enough to leave. Remember Ms. Dodds? Hi kills her twice and meets her three times! Also, he kills the Minotaur again in book 5. (Forget Hylla twicekill, percy is Percy twicekill twice!