just out of curiosity. in these "insta-buddy" horror stories.. How often do most people talk through the dive plan? And clearly identify a lead diver and a following diver?
I have only found myself in a purely "insta-buddy" situation twice.
The first time, the guy barely spoke English and I had to chase him down a couple times.
The second time, I was much more experienced and planned to let the "buddy" lead the dive. I am a pretty good tail so there was not much chance of him getting away from me. And I can enjoy a dive and still be able to keep half an eye on the buddy.
Its not unusual for me to pick up a new dive buddy, but we plan things out and talk through the plan. ALWAYS.
..... A buddy that blew the plan and either took off, or failed to maintain the follow, would not ever get a second dive with me.
I always try to talk through the plan. I will discuss the lead but in my heart I prefer to do it since most often the other diver will charge off faster than I like to go. We will have an agreed signal for switching the lead. If I get added to a pair of experienced regular buddies then I usually go along with their dive plan as long as it looks reasonable.