Originally posted by coolwhip
I really do not think that this is the case. I think (and hope) that the Hell Hounds will be against the humans, the best way for the Hell Hounds to work would be if they were counted as "Boss" type enemies and only appearing a few times in the early (easy) rounds but once you get into the higher rounds they become a lot more common and eventually spawning the same amount as the normal zombies in the really high rounds.
I think this would be a good idea as if they spawn a lot in the early rounds you will become used to them quickly and they won’t pose much of a threat, where as if they are mainly in the high rounds people won’t get chance to get used to them and they will be a lot more deadly because of that.
Anyway enough of my waffling on.