User blog comment:Powergamertiamatfan/How much of a hypocrite Cadderly is./@comment-36269295-20190502231721

Hi! I read the series recently, and there's a reason why he did this:

Do you remember what happened when he tried to do more than kiss Danica the first time? She attacked him!

Thus, he knew something was wrong with Danica when she suggested they have sex, almost straight after. The Chaos Curse had just been released into the library, after all, making almost everyone abnormal! Luckily, Cadderly was super smart and realised something was going wrong.