Reanimator multiple zombie spawning

Howdy.

1) Go to Lunaris Temple lvl 1.
2) Use Raise Spectre on Reanimator, he will spawn 3 friendly Raised Zombies.
3) Go down the stairs, Reanimator will follow, Raised Zombies wont.
4) Portal to town.
5) Travel Back to Lunaris Temple lvl 1 via way-point+walk
6) Reanimator will spawn 3 friendly zombies. Now you can have 6. Only 3 follow the Reaniator around, the rest staggers aimlessly. Fun.

Here's me and my zombie mates: