If you ask me I an not imagine that the aircraft was designed to fly without a suspension bar, rather than say , without one main rotor blade . . .
Just the same would happen if you broke one suspension link doing 100km/h with your car, the rest of the links are not made to take up the increased load and your wheel is likely to break of and/or cause major control problems.
If the front bar came loose the gearbox would probably tilt backward and the airframe pitch down to the degree that the MRB would come in contact with the tail within a split second ?
Of course all of the above are pure speculations from my side.