the thing is lucius hardly knows ed. and yet he tried to reach out to him. when he first realised that ed was the one behind this, he called him “nygma”, to himself. but when he saw ed face to face, and saw how lost and confused ed was, he called him “ed”.
he stayed calm and rational in the face of ed’s mania, and he clearly pitied ed, and wanted to help him. even after ed tried to kill him, even after ed threatened bruce and harvey, even while ed had a gun on him, lucius stayed levelheaded and reasonable, and kept trying to reach him. because he could see how much ed needed an anchor, someone to help him.
in 2.21, ethel peabody asked lucius if he had much training in mental health, and he said “none. none at all.” but he didn’t need any training to see that ed was hurt, and confused, and unravelling. and he didn’t need any training to reach out to ed, and try to convince him to get the help he so obviously needs.