I didn't read all the posts, but what is the difference with the thread earlier? Why this similar thread?
I still have to answer that I will let the buddy go up to the surface alone, if he/she is a stranger. I might regret it later if something bad happened to her, but I don't see that I can provide good help if I was injured. Different with good friend or family, I'll go up with them, I guess it's different about how we see things in different situation and who the person involved. The main reason about why I would risk myself by riding up with someone I know because I can say that I know their ability and I'm sure if they can help it, they wouldn't do that. For strangers, I don't know whether they are fooling around and end up risking themselves and others, and I certainly wouldn't want to risk my life for this reason.