Phase Spiders in Dragon Necropolis
 

For each phase spider I've engaged in the Dragon Necropolis (as a mage), my pet repeatedly gets sent back to the entrance of the map (zone-in) throughout each mob fight (1-5 times per fight). Pet and phase spider run back to fight each other as normal.
Text reports each time:
"Zobn Gates."
"Zobn fades away."
There were also instances of the spiders giving the summon message "You will not evade me Zobn." Although, I wasn't sure if my pet was ever actually summoned. If so, this seems redundant.
As I engaged spiders that were farther from the entrance, it became less feasible for me to continue.

Phase spiders phase you. That's the joke.

Yes, I put two and two together. But is it meant to be a teleport that boots you clear across to the zoneline?

I'm not sure how I could effectively solo the spiders that are even deeper in, nonetheless have to deal with other spiders adding if they had been respawned.

It's been years, but I remember it being more of a shadow step. Don't hold me to it though, but they do screw with you.

The shadow step gates your pet to its summon point
It also heals your pet the same amount as an NPC gate

These types of procs should not work on pets