Guardians' Resolve

The Guardians attack all humans who dare trespass on the ruins of the Ancients. While animals are free to come and go, anything that stands on two legs is met with immediate and brutal hostility. Without eyes how do they see what they are attacking? Some of their attacks are sloppy and seemingly blind, so perhaps they rely on the other senses in combat. How they stand and fight without muscles in the first place is still a mystery.