Today we found an issue in this very pop Nagrand quest series, used to boost characters quickly out of TBC level.
Depending on who in the party took the first hit against the arena enemy, the quest credit might not be properly dispensed to the quest taker.
That led to the issue - Leaving and retaking a quest in the ring of blood series became a bit dangerous.
Immediately retaking the second round of the series led to the spawn of 4 rather than 2 murkblood brothers. The quest still failed to acknowledge credit ( even if I did it alone ) and retaking it a third time once again doubled the ammount of blue brothers. (to 8 ).
Must be good for overgeared players wanting to test their characters, but its a bit stressing when all you have is a lvl 65 and someone trying to get them out of the 60s tier.