Nicely put! Interestingly, the least we know about the “monster”, the more it can make us feel dread (even if such monster is just a human). Normally, fiction tries to portray characters as thoroughly as possible. However, horror follows a different set of rules. When we don’t know what to think of the object of horror (be it a cosmic beast or a creepy child), we start to fill out the blanks. And we fill them with what we find most terrifying. In other words, when we don’t know what a character in fictional horror will do (in the sense that we cannot decipher or understand his motives), we just assume it will do the worst thing we (at an intimate and subjective level) can imagine!