“Does any here know me? This is not Lear:”- What can be comprehended about Lear’s mental state from this line? What reason does he have for such outrage?

Read the passage. and thus they fought all the long day, and never stinted till the noble knights were laid to the cold earth. and ever they fought still till it was near night, and by then was there a hundred thousand laid dead upon the down. in the passage from morte d’arthur by sir thomas malory, what are the bolded words an example of?