merch you are correct in that my statement was not fully explained. We are dealing with a bunch of pilots so need to keep it simple.
In the angle of loll the vessel is inherently unstable, GZ is greater than GM there being no righting moment. A situation in those weather conditions the vessel was not able to recover from. But that is only my opinion of the situation. Having got into that situation in the first place and given the weather conditions I would imagine the crew did not have the knowledge to extricate themselves from the delicate situation they were in. It sounds like you know that what you describe requires a certain level skill for if not done correctly the results are a capsize.
Nice to see someone with an understanding of these things.