we tried this on kara (attumen) easy boss, only need about 5 ppl, so 9 isnt too bad if sum1 goes awol using this bug.
what happened for me: alt and main infront of boss, obv i want main to be involved with the kill, on alt, 5 seconds before pull i start to relog, 15 seconds in combat. log onto main, hes outside the entrance and cant enter, i tell raid and log on my alt, alt gets the spell dmg ring and a badge after boss is dead, log on main, he cant get anything, and i continue the raid saved on 2 chars to a finished instance, oh well, i learned the hard way