Quote Originally Posted by TWOxACROSS View Post
It works out well enough to just group up and run in one direction. That way you don't have to communicate that you've found it, and people aren't still in the dark about exactly where it is. Splitting up has meant that people can see I've stopped and found the boss, but can still end up running right through the AoE.
You really only have to run to opposite sides of the arena. If neither pair sees the dragon, then the dragon is clearly not diving through party. It's not necessary to search the entire perimeter.