There is one big problem with telling people to watch them if they want but the group continues on...you vets tend to avoid killing a lot of things and new people don't know where or how to avoid them. That happened to me in Castrum. The second cs started right in the middle of a damned fight [WTF!] and by the time I managed to get out of it everyone was gone and not even showing on my map. I stuck my head into the next room and promptly got killed by about 6 mobs. Someone finally realized and came back to show me the route.