Cradle of Death Map - Question

when i come to map name - Cradle of death
I got a Question.
View this Video

Who can told me. What is this? How can i kill this Guardian. haha lol

 

In the video there are two mobs. Also try to bring him out of the red circle...

 

That guy on the same corner chased me a ways up the stairs once, I couldn't ever get him to repeat it, or influence him to do anything other than spin in circles. I thought it was just some kind of error, but now i'm more curious.

 

Funny that happened to me as well but to no one else in my guild. When I asked them they all thought the cheese had slid off my cracker.

 

Intresting.
I never came across this in CoD though I farmed it a hundred times for XP when I ran out of quests.

My first thought when I saw these silent gaurdians was, "these guys are gonna be fun" and later was disappointed to see them simply stare at you untill we run out of their range of sight.
I was expecting them to fight us atleast when Mortis and the Ferryman get ANGRY in one of those final quests.

 

Same, it happened to me on test server once, but I've been unable to replicate this since. I figured it was the one unimportant bug that BP actually managed to find and patch before the release, but it turns out I was wrong... but what was I thinking... BP find and patch bugs? That would be too much like doing their job!

EDIT: OHHHH, I see! Upon watching the vid, it happens because of the buff from the mini boss! Cool!

 

Yeah, it's kind of an interesting change of pace just to see how far you can make him go. Wherever you end up killing the monster with the buff is where the guardian stays also.

 

No buff for mini boss was present when it happened to me...

 

So I played with this for a couple of hours tonight, seeing if there was some hidden achievement for it. This seems more than just random weirdness, but at this point who knows.

I was able to get two of them on me at the same time. Wasn't able to get three as they disappear at a set range from their starting point. I tried taking them to points on the map like the lightning source doors, the skulls, and the little towers you turn during one of the quests. I even tried making a bunch of them disappear. Got to 6 gone on one map before I ran out of mobs within reach of elites. Not sure what else to try other than wrangling 3 of them at once. It's time consuming, if you get the wrong buff on an elite, you have to kill it and let it respawn until you get the right buff.

I could only get them to move using the one large aoe buff for spd I think it is. The shamans are the worst to get with it as they follow at range to spit poison. The warriors are the best with the fiends in the middle difficulty wise. This seems more than just random weirdness, but at this point who knows.