User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-6068707-20130327021617/@comment-3146930-20130327032551

That's just all kinds of complicated. I mean if for example, Leo was hitting on Hazel (which he isn't), Frank could get mad. If Hazel was hitting on Leo (which she isn't), Frank could get mad. However, Hazel basically wanted to learn how they were connected so she started spending time with him, which isn't something Frank could get too mad about. Leo and Frank even have a moment to talk it out at Camp Fish-Blood. If anything, Frank should be mad at Leo simply for all the jokes and pranks Leo pulls on him. However, considering even when Frank is very upset, the worst he says is "Dang it," I don't see him flat out threatening Leo (but Hazel and Leo's closeness after the flashback did cause the couple to have a fight).