Distance to nearest exit 850', one guy's cylinders are empty, the other's only have 500 psi in them.
It looks like this dive was a complete Charlie Foxtrot.
Only someone who was looking for a reason to run their hose from the left post would look past the multitude of *other*, more basic mistakes made and draw the conclusion that the long hose on the right post is a bad idea.
Diving a DIR configuration doesn't make someone DIR. And DIR is in itself not a panacea, it may radically reduce the possibility of a fatal error, but it certainly doesnt eliminate it. Nothing can.
One of the more umbrella conclusions that we can draw from this information is that yes, if you make enough mistakes you can in fact die in a cave.
Roak
Ps. Another conclusion we can come to is that this note was a pure troll, since BMS asked a "quick question" and then argued about the answer. If you want to debate something, at least be honest about it. You got your answer, DIR configures the backup (not "alternate") on the left post.