I Am the Law and I Am the Lash (Horde)

If you are stuck in 5.04 just drop your disguise, kill the sergeants first. After you complete that quest, put on your disguise again and start hitting orcs =)

If you turn in Abuse power and lose your Blackrock Orc Disguise don't fret you can still turn in the quest, simply go back to Thelaron Direneedle and Loot the Tailor's Table next to him with the following mats below and turn them into Thelaron who will give you a new disguise.

2 hides
4 Handfuls of mud
2 Spools of thread

For this quest you can actually continue to clobber one unsuspecting soldier over and over until they die and you'll continue to get quest credits as if it were a different guy every time. No need to actually hit 20 dudes, and if it discovers you, you'd have to kill him anyway so not much lost. I'm not sure if one mob counting as multiples is a glitch currently, but worked as 11/24/10.