"A buddy at her fin" was just an expression. I mean being a buddy in the context of actually being a buddy- not sharing the same ocean. A person is usually the same under water as they are above it. Some people are attentive, others are not. Some people take risks, others do not. In diving, there are certain buddy protocols we were all taught. They are put in place for the safety of both divers. To my knowledge there is no number of logged dive requirements to then be able to take a course of solo diving. It is not recommended and in fact it is expressly forbidden. It goes against the rules. If you are in a buddy team and you have the expectation that your buddy, after discussion, is going to be a buddy in the sense of how we were taught, only to find out under water they are not, then you should bring it up and work to resolve it to both parties satisfactions and if it isn't resolved you should look for another buddy. At this point, some people choose to go it on their own. They do break the rules. They feel confident in their skills and take additional precautions to minimize the risk of solo diving. However, it is a risk and it goes against the rules. Rules that were written to best ensure a safe dive. You can have a pony. It won't do you any good if you find yourself blacking out for some unforseen medical anomaly. In that instance, you cannot aid yourself and no amount of self-reliance will save you because you are no longer conscious. However, if you had a buddy, who was doing as they were supposed to be doing, and they noticed your distress, they could make sure a reg stays in your mouth, get you to the surface and call for help as quickly as possible. Without a buddy in this scenario, you are sinking and breathing water. (most likely) Diving alone means there are some circumstances you could find yourself in for which you will not be able to survive. period. It does not mean you absolutely will survive with a buddy, but the chances are greatly increased if there is another person with you. No amount of experience or training can get you out of certain predicaments and that is all I am trying to say about this particular incident. I am aware that she obviously had other things going on. That is the point. All we an do is speculate as there was no one there to witness and share what happened. However, the reason I say not staying with the group was the ultimate cause of her death in this instance is.....if she had stayed with the group and she had her buddy and they were experienced divers in 10feet of water, odds are they would have reacted to whatever her issue(s) was and saved her life. I think solo divers "know" that but they do not really "believe" it. Each time you do it you become more confident doing it. Then, there is that one time.....that one or many unforseen things happen, and you realize, maybe too late, it would have been a really good idea to have another person looking into your face mask.