I once had a somewhat similar situation and dealt with it very sililar to what it sounds like this guy tried to do. This is the story.
I went out on a boat without a buddy and rather than getting stuck with one buddy of circumstance I got stuck with 2, the threee of us were the only one's on the boat that came without buddies. The dive was to 60' the Iberia wreck. We were all gearing up together and I asked if everyone was ready to jump in "yes" was the reply I got so I went in 1st. Needless to say they were not ready and I waited int he water for what seemed like 5 minutes holding the granny line in moderate swells the whole time getting bobbed up and down and getting banged against the hull of the boat. The bobbing and banging against the boat started getting to my stomach with some queezyness and then my head which made me start to breath pretty hard. I followed the granny line back to the stern, we had dropped in on the starbord side, and stood on the ladder for a few minutes to calm down. Once I was calm I look up and all I see of them is their bubbles. I was ready to go, I dropped in the water went under, I felt totally fine and followed the granny line to the anchor and dropped pretty quick since I can clear my ears quickly. I found the 2 buddies about 10 feet from the bottom and we did our dive.
I learned a few lessons from this:
1. Try at all costs to bring one of your regular buddies with you on a boat dive
2. If you get stuck with a buddy or buddies of circumstance then make sure that you communicate all of the plans including what happens if someone has to call it at the surface or call it anywhere else.
3. If you get teamed with 2 buddies of circumstance who also do not know each other, then maybe you are better off not diving or maybe even diving with another buddy team who does dive together regularly so that they will pay a little more attention to you because they probably have a better sense of how their other partner dives to begin with and can predict some of their behaviour.
Just my story and thoughts,
TTSkipper