The helicopter was in total control until a point,
At that point the clock counter clocked 3 seconds before it hit the water.
However 1/6 of that 3 seconds was all it took before it lost the point of no return, ie .5 second was all it took for the situation to get out of control.
I agree a helicopter is most unstable machine. To try to control one in hover is described as trying to balance a pyramid upon it's apex. if ever you have dealings with a helicopter don't imagine it is nearly as stable as it looks.
olewill