It appears from that video that the aircraft came out of cloud inverted.
Edit:
Or, at least going inverted shortly after.
I flew Blackhawks for a few years and I can think of one failure that would cause the aircraft to pitch nose down. If the (normally automatic and active) tail stabilator motors fully down in the cruise (it should be up by around 40kts IAS if my memory is correct but it was almost twenty five years ago) it needs to be promptly dealt with by selecting it to manual and motoring it up to a neutral position.
If instead the stab is left down and the cyclic is moved an long way aft, in an attempt to correct the nose down attitude, it may be possible for the MRBs to contact the rear of the airframe.
Last edited by ShyTorque; 16th Feb 2023 at 09:14.