Differences between monsters?

[Danny Boy]

Grunts can see and hear and do enough damage to kill you in three hits. Brutes are blind (no eyes, after all) and find you through their sense of hearing. Most of the time, a brute can kill in one hit and I believe brutes run a little faster than grunts. They can also bring down doors faster.

they're not blind, you can find an eye in that mess

The only "bilnd" monster is the suitor from Justine.... but even he haves a sight range