Stormwind: Defias Breakout event might be missing
Every full hour and half-hour a group of 4 Defias Rioters (npc=5043) would charge from the Stockades towards the guards for a brief combat encounter where the guards will murder them with ease.
I've been checking if anything like this happens, and it seems that this particular NPC is not even in the db.
Prior to them spawning and charging outside of Stockades there should be a sound of cell doors opening and closing 4 times in a row with 30-45 seconds between the sounds.
This is how the NPCs should look like: