Just to bring a little lighter note to this post , OP , if you want to run with a player who pretty much has to listen to their fellow Gears due to a complete lack of sight but is relatively good at the game considering , I ' m happy to run with you when we ' re both free to do so . <| sep |> I think all of your three points sort of tie together . Your points 1 and 2 sort of combine into the same answer if something is the most likely outcome in a panic situation , you might as well make that Plan A , instead of Plan B . In an emergency situation things need to be automatic reactions . Anything you need to think about makes you lose important time . With that being said , the main proponents for this setup Which is generally called DIR for Doing It Right are the technical diving community . When you ' re inside a wreck or a cave , there are a lot more concerns than in open water . For example , two people can ' t swim side by side through a restriction , so the donated air source must be something that allows the donee to swim in front of the donor . With your traditional setup that isn ' t possible , because there ' s no hose long enough . With our setup , the 210 hose easily allows this , even with tall divers . Obviously , you ' re probably not going to be inside wrecks or caves any time soon , so that ' s not something you need to worry about . But another key aspect to the DIR diving philosophy is that you should pretty much always dive with the same setup so that you ' ll be 100 % familiar with it . Which is why I ' m always diving with my double tank set unless diving rebreather , even if the dive is a chill reef safari that could easily be done on a single tank , for example . I don ' t actually even own a single tank rig anymoreIf you ' re a new diver , most of these concerns aren ' t crucial to you at this point .