attacking through the fence I assume? They do that alot dont they? I heard they just sit there and grab whoever comes close to them.
This one flew down into the yard after quail and I saw it through my kitchen window. Years ago I learned that a covered yard is the way to go. One is always taking chances when chickens are allowed to range. It helps to have low trees and bushes where they range. Mine hear a Blue Jay or crow and head for cover.