Ok? It broke down on a mission, maybe its a good thing that the Chinese copy it?
What use is a piece of equipment if it can not even complete a mission.
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The question is did it break down or get shot down by a rpg when hoovering over the target.
Since that is not known and maybe never will be known, why state it one way or the other.
But its still hard to believe OSB did not have some guards defending his safehouse on duty 24 hours a day. Such guards may not have lasted long given seal fire reining down, but all it takes is close from a rpg to disable a helicopter. And its also hard to believe a helicopter could make a long flight all the way to target, and pick the mere seconds after arriving over target to pick that moment for mechanical failure.
The last thing to point out is that will never be a true stealth helicopter, they make a lot of noise, may have a limited radar signature, but are clearly visible to human eyes. A radar stealthy Jet has the speed to take advantage, by the time the human eye sees it its already gone, but that is not true of a slow and lumbering helicopter, especially when it hoovers mere feet above the ground. Making it a sitting duck.