There are very few people I care to buddy up with (that is who are available to buddy up with). I buddy with people I know fairly well. We dive together often enough to know what to do in situations such as the one you described. Pick up buddies too often are a PITA (as I am to them, being a videographer) and I try to avoid that whenever possible.
My incident rate over some 48 years of diving shows I am 20X more likely to have a "dive threatening" incident when buddied up than when I dive solo.
As you mentioned, there are those you have developed excellent buddy training whether they be Unified Team Divers or DIR or whatever you wish to call them. Many rec divers make pretty poor buddies unless they have had enough experience (or wisdom) to know how to buddy up properly.
My incident rate over some 48 years of diving shows I am 20X more likely to have a "dive threatening" incident when buddied up than when I dive solo.
As you mentioned, there are those you have developed excellent buddy training whether they be Unified Team Divers or DIR or whatever you wish to call them. Many rec divers make pretty poor buddies unless they have had enough experience (or wisdom) to know how to buddy up properly.