Well, we all know that 2 minibosses Rimefang and Spinestalker(?) is connected to Sindragosa. When you kill 2nd miniboss Sindragosa fight begins.
The bug is when you pull 2nd miniboss (doesnt matter which one) to the room with spider adds and kill it there
after it's killed a healer must get aggro in the spider room and let the boss get in the room.
If you could succesfully do that the boss will be in room always without leaving combat/reset, and there will be no air phase.
This will significally help you against heroic mode of Sindragosa, since normal mode is a piece of cake.