[sblock=Albedo]Michael's description in the first post states that he has a Greataxe, does he also have a sword? Also, is Sean ethereal? If he is, then Michael needs a way to see invisible/ethereal things.
Assuming that Sean is still ethereal, and that Michael can somehow see him, Sean will manifest (standard action) and put his bow away (move action). His goal is to try and maneuver so that he can move into Michael's square with a move action (drawing his rapier along the way, which bumps his AC from 29 to 30), and try to use his Malevolence power on him (standard action, Will Save DC 24, no AOO for moving into his square to use Malevolence). If the Malevolence power works, then great! The fight is over, and Sean didn't have to kill anyone. If not, then things will get much more tricky.[/sblock]