But let's say the DM did, in fact, tell the wife to go down with the first group while the husband and another diver who had trouble descending before went with another DM, with the plan that the buddies would reunite on the bottom. Can we agree that's not OK? Can we agree that, while the buddy couple should have said no and insisted on sticking together, that they shouldn't have been put in that position in the first place?
I don't know, in part because I don't know how much the DM knew of the capabilities of these two. The word 'told' is a bit perilous, too; is being 'told' taken as a suggestion (i.e.: how about this, are you all right with doing it this way?), a request (i.e.: please do it this way) or a demand (i.e.: a person in perceived authority giving a directive that'd be at least awkward to challenge)?
The other reason is because I suspect a number of divers would be okay with going down with a group to a defined meet up point, never alone, while their partner was escorted down by a dive professional along with another diver. This could reduce the task loading on the DM, who only has 2 people to monitor during descent.
Not everyone would agree to do it that way, but I think some would, and I'm not convinced it's unacceptably dangerous to do so.
In another matter, I've got to wonder whether her going down with those 3 would have been of any benefit. They both made it down.
"When they were all together, Sharp was about eight feet from Monday and the group was about five feet off the crater’s wall.
They looked at each other and Monday motioned with her hands to ask Sharp if he was OK. He signaled back that he was."
Then
"When they were all together, Sharp was about eight feet from Monday and the group was about five feet off the crater’s wall.
They looked at each other and Monday motioned with her hands to ask Sharp if he was OK. He signaled back that he was."
I wonder how much more 'buddying up' they expected to do. Any pre-dive checks would've been done back on the boat. They both got down. He signaled he was okay. They were with a group, and paused to watch some sharks for a minute or so.
What more were these 2 going to do with each other if the sharks hadn't wandered by and the DM hadn't banged metal sticks together and pointed them out?