How is Grendel characterized in this passage? Fearful, sickly, troubled, peaceful

There is no excerpt.

But I found this one:

There was nothing to stop the advance of man. Huge boars fled at the click of a harness. Wolves would cower in the glens like foxes when they caught that deadly scent. I was filled with a wordless, obscurely murderous unrest.

If that is your excerpt, I'd say Grendel is fearful.