Pilot Fish is mixing up what another poster in the same thread recounted about what happened to her at depth while her husband was surfacing, NOT the original poster.
If we know that there was an investigation, the perpetrator was in police custody at the time, and he was expelled from PADI, as was confirmed last year, there is nothing more we need resolved in this thread.
The Spiegel Grove incident that Pilot Fish mentioned was covered ad nauseum in the original thread, mainly by PF, as I recall, and the various contributing factors were all discussed in that thread.
Like others have said, coroners reports don't tell us the real story, because they only confirm the eventual cause of death to be drowning. They usually do not determine what factors contributed to the situation in the first place.