I didn't even know about Michael's raft, though in my game it's still moored with Michael's body on it; although I guess your point is that he was well on the way to Orobas Fjords by then...
Oops. Actually, now that you mention it, I think I just forgot that aspect you mentioned in your game.
Apparently he made it off the island before or during the attack, but not out of range of the poison.
