Phase Spiders in Dragon Necropolis

[QFuzzle]

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.