Just from what i read and "heard" (which-btw-is NO "insider-knowledge"!), it seems to me that the pilots did something…..lets say "stupid"..
I hope i am completely wrong with this…..but it seems to me that they were trying to do some "tight and low turns" to say "Good Bye"…..maybe overturned it (you all know the "tight right turn & collective"-stories)..
I do NOT say it was a pilots error…just my feeling from the articles, the "witnesses stories" and experience from previous accidents give me this impression…...