Several encounters in Blackwing Lair now cause the front gate to close, preventing players from zoning out or joining an in-progress battle.
The Razorgore encounter has been changed slightly to make it less "random". The spawning should be more consistent throughout the fight.
The timer for Vaelastrasz the Corrupt is now more persistent. You can no longer reset the one-hour time limit for beating him by leaving the instance. Also, Vaelastrasz the Corrupt will not respawn for 12 hours if he has not been beaten when the timer expires.
The drakes in Blackwing Lair will no longer leave the lab.