Bug or Luck?

While mapping....
I had this spirit, next to an abyssal and there was a rare totem, which can be activated.
Spirit was in the totem, which was buffed from abyssal too.

I have screenshots and a video clip from this situation.

A very strong rare monster, with many mods revived all the time rare monsters in his near.
They spawned with 20% health and they dropped all the time rare gear and lots of blue gear.
(Always body armor)

I noted that after 5mins that he revive all rare monsters.
I died 4times there because there were so many different AoE "events".
Falling stuff, green laser, running animals (bulls) and more..

My screen was full with gear.

After 15mins, I killed that guy, because I had only one life left and that was too much gear.
I could farm him but it was too risky for me at this point.

After 15mins, I had something around...
3 uniq, 25x rare over 10x blue with lvl 5, 10x lvl 4 and much more on lvl 1-3 blue gear.

I pulled him away to loot a bit, because my entire screen was full with stuff... before I finished him..