Saying as little as possible
If the captain is currently "invisible" and keeping "mumm" then that is the best thing he can do. He can simply build up a record of all the scurrilous comments etc and in this litigious day and age wait for a chance in the future to sue. I feel for him not just because it is taking so long but also because it was not as if a problem arose at 30,000 but when you are just 600 feet above the ground you hardly have time to think and simply react as best you can. How many of us have said " C****t that was close - why the hell did I do that" or "why the hell did I not do that"
Leave the guy in peace. I just hope he is receiving full pay because if he is not and at the end of the day he is completely exonerated of any major or minor misdemeanour it is going to cost Willy a packet.