Exactly as OP says. Just have the boss start the animation 80% or so through the cast bar... Have the boss start it's animation before the AoE circle disappears... So the second it does disappear - the bosses attack has hit / exploded. It's so friggin' lame to have an AoE circle disappear while you're in it... You move halfway across the map... and 2 seconds later a meteor drops on that location you were in and then you take damage super far away. Hate it, hate it, hate it... To heck with the people defending this dumb crap. It seems like an easy fix to me. "Boss starts animation 80% through cast bar instead of at the completion of the cast bar". HOW HARD WOULD THAT BE?!