Where Now?
The survivors are obviously not in the best mental condition so it is not clear how much their testimony can be relied upon at this stage. However, the way the matter is described, the vibration and yaw at and just after TO does seem to indicate a stall? Would it be reasonable to speculate on the most likely causes thereof. But then of course we are back to square one. Almost.
Regarding the terrain between parallel runways, I can only add that if this had happened under similar circumstances should there have been similar terrain between parallel runways at LAX, the Americal lawyers would already be salivating at the prospects. But then that would, of course, be true irrespective.