Allright, when i was doing karazhan with my guild i was bored.Then i saw that nice spot there. you can avoid the trash clearing BTW shade to chess event allright what you need is
1.A druid any spec.
3.Rogue or another druid.
Near shade door the 2 warlocks should killthem self with the ability hellfire.
Then the druid should go cat form and stealth and go to the other side near chess next to the repair guy
The druid has to BR one of those warlocks.then he gona summon one of the healer to res the warlock,then summon all the raid there you go!
I HOPE THIS GONA SAVE YOU TIME IN KARA! HAVE FUN !