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As for how to beat him, IIRC he doesn't heal himself while you're attacking him. So you'd need at least one character with good enough accuracy trying to hit him.
Maybe if you do it again and post a gameplay video, it might help OP better understand how the fight should go? I've seen a number of people who have trouble with Mark, and some of their fights may be glitched.
But barring that, here's some videos of varying lengths that might help:
https://www.youtube.com/watch?v=NcsOZMLm0AA
https://www.youtube.com/watch?v=IA1cSbFGqN8
https://www.youtube.com/watch?v=BsDWpoepLM8
https://www.youtube.com/watch?v=Rvh8_5k83a4