The report was prepared in mid April of 2015...Oil was $57 by the end of the year 2014...That will be decided in court. No explanation given whatsoever in the footnotes of the MOR how they justified such a large writedown.
If you walk into a courtroom and say it takes me 60 minutes to get from Point A to Point B, no ifs ands or buts, but then someone stands up and says Not so fast, I can do it in 25 minutes, and here is how.....most likely they are going to give you a chance to show how your 25 minutes beats 60 minutes.