I just accidentally found what I think is a bug..

I'm playing a summon tainted / bloodboil WL, and I was able to "deathmark" my tainted pack to an area that I would only have access to with teleport...

Basically, I'm running to baal in a solo game, and somehow a room adjacent to my actual location was illuminated with monsters. On a whim I deathmarked my demons in there, and it worked....

Bug or what?

I know this is wrong forum for this, but I want some eyes on it..