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Keep debuffs/buffs after boss fight
After doing the random heroic daily today I used a macro to leave group as soon as I recieved my emblems of frost (for a different exploit) and I was able to keep the Intense Cold debuff that Keristrasza puts on you for not moving, while outside the instance!
As you can see in the screen shot the debuff is working becuase I am taking damage. Jumping removed the debuff as it says so in the tool tip.
Also note that I am in Orgrimmar so when I left the group I was ported instantly and how I left the nexus the same second that Keristrasza died (timestamps). Server lag could increase the chances of this working however I did this in the morning and gameplay is about as smooth as can be.
So im thinking that with other bosses that put debuffs/buffs that are auras with no time limit, you could keep them almost indefinatly using this method.
Logging out probably wouldn't take them off but dying surely would.
The macro I used was
/run LeaveParty();
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