The Question and Answer section for Le Morte d'Arthur is a great resource to ask questions, find answers, and discuss the novel.
I think irony might be a better word to use than contrast. Lucan tries to help Arthur but is actually in more need of help himself. When Arthur finally comes to (after being helped by Lucan) he witnesses Lucan, "foaming at the mouth and part of...
It is Arthur's destiny: Arthur was meant to bring peace to a fractured country.