You can Radiance of Splitpaw have done it that way
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Merged Post
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The fail effect is because someone hasn't ran to the correct mob to sure the incureble
You can't stand in the middle of the room. You get a fail condition that says you stood too long between the night and day or something to that effect and your raid blows up.
The way we did it was 1 tank tank night at his wall and another tank tanks day on his wall with their healers close by
rest of raid stand in the middle of the two dragons with a MA swaping between the mobs aka on pull get one mob to 97% then swap and get that to 94% swap back and get that to 90% swap again and get that mob to 86% ect *IMPORTANT* Makesure they dont go more than 5% health difference else will cause supernova and wipe whole raid.
And if you get the incureable run to the relevent dragon BENEATH ITS FEET
When the curse is cleared you will get a green message across your screen. We have run into a few times where a person who crossed over to the other side will have their curse cured and then they get hit with the other curse. If that happens you have to cross back the original side.
Have yet to see the curse hit a tank, it does seem to like healers though.
Our first kill was three groups, 2nd kill was only two.