Mobs Stacking again, maybe

I was stress testing my BA/WP Brute in a paper missions, and I noticed the mobs stacking when breaking line of sight. Each time it happened was in a warehouse map, using the corners with the boxes at the edge of the corner. The mobs would jump over the box and stack. Using an attack like Beheader would only hit one mob, but Cleave would hit all in the stack, as would Pendulum. As you can imagine with sufficient Fury you could easily two shot an entire pull. Mobs that I was able to do this with were Freaks, Family, Council and Arachnos.

I tried doing it on other map types and corners without an obstruction but the mobs wouldn't do it. It seems that obstruction on the corner triggers the stacking.

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"If I were two-faced, would I be wearing this one?"
- Abraham Lincoln

I suppose I thought it was "working as intended" since until recently, I've never taken on more than four to five enemies at a time when soloing.

I've noticed that if I apply "darkest night" on an enemy and fly around above him so he can gather aggro for me, the group of enemies will find any nearby object to try to jump up near me. Enemies have been doing this for the 3.5 years I've been playing however I've also recently seen them jump on eachother's heads when there were no other objects in sight.

A good friend playing a dominator froze them in that stacked position for the rest of the team to see. No pic unfortunately.

Because the rest of the team was made up of veteran brutes who seemed rather unimpressed with our Council double layer cake, I concluded that the stacking was nothing new to them.

/e shrug

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