Without a doubt, your server has a following of tards that like to call out the name of some cool-looking mob they found that, since Besieged is just like dynamis, is the MEGA BOSS that will force a retreat.
Of course, these people are stupid and completely fucking dumbasses who draw resources from protecting the general and leave people who'd help out of the zone, but is there something to the idea that Beastmen, like Al Zahbi, have Generals?
I've been watching certain mobs in the Undead Swarm attack for a while. I believe their Generals are larger, stronger versions of the Cantatrice, Shiranuhi, and Commandress.
http://f5.putfile.com/6/16018183755.jpg
For example, here is a normal Shiranuhi. They appear in the first wave and are the same size as a Large Elvaan model.
http://f5.putfile.com/6/16018240256.jpg
And here is what I believe to be a General Shiranuhi. Larger than a normal Shiranuhi, with insane defense and evasion. Perhaps further evidence is this:
http://f5.putfile.com/6/16018231433.jpg
When unaggroed, it does the /cheer emote from the opening CS.
My theory is that either the defeat of all the Beastman force's generals or the defeat of a majority of the invaders can cause a retreat.
Anything to this or am I banished to Zam?