well ya, then y dont they apply what they did with potions and stuff. dont start the CD timer untill after you are out of combat. Also make it so you can only receive a BL one time in a single mode of combat.
That way theroreticly, BL is allways usable on fights considering you have enough shamans.
The shaman who uses BL their CD wont start untill after they leave combat. Just like potions.
But Also leave up a 5 min Sated Debuff, that way say you use BL during the last 30% of a bosses health. and the boss is dead you still have a sated debuff. for a few min.
The 5 min stated BL will make it so that once down the road. When people are geared up from Uladar and know the fights and it becomes slightly easier and people start blowing threw it all in one night like people do with 25 man naxx now. When we get to that point i can almost garantee there will be plenty less than 10 min periods between boss pulls. Considering you have a good group =P..
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