Possible bug with lifedrain attacks? - developers please read

[rabelais]

Originally posted by mivayan:
This is from a developer post:
"A life drain attack regains damage*2 fatigue and damage/2 HP. It also causes damage/2 extra fatigue on the target. Only lifeless units are immune."

I was under the impression that undead couldn't generally drain one another, though most of them do not have the "lifeless" tag.

Could someone clarify?

Thanks,

Rabe the Golem Groupie