Super VC-10
The crew of UA885 saw the aircraft was coming down short of the runway.
Did they communicate with OZ214 by radio to warn them or not? Do regulations prevent them from doing so? Could they have contacted the tower instead?
Maybe they did, or is this another hole in the cheese? None of the above is intended as a criticism of the crew of UA885.
From what I've read, the crew of the United plane were fairly occupied with checklists, a hazmat issue and some other things. They told the Tower that they'd need a few minutes before they could depart. So I think it's likely that they were heads-down and not watching the Asiana land.