Not Buying the story about the geese bring the helicopter down. There are lots of videos from different angles and none show geese, also after  "The miracle on the Hudson" the FAA is tracking geese migrations , the question is: did the roof come apart first ? causing the blade to chop the tail boom off, or did the blade chopped off the tail boom causing the roof to break away from the cabin?

The tailboom had been damaged on the ground at some point in the past, whether during ground handling or careless behavior by those working or walking around the aircraft.  A small dent on the tail skin creates a weak point that will cause the very failure that can be seen in the video.  Even the slightest dent should be inspected and/or repaired.  

but yeah

It’s the Humpty Dumpty syndrome.  Even when you have all the pieces, it doesn’t come together.  

If you look at the picture you can see one pitch link under swashplate. One blade out of phase to this degree and there goes tailboom and all!  I was landing at Columbia county airport which is same freq. as river and somebody announced flock of geese on river at about 1510.

for anything, especially something recent when you don’t have the expertise to properly investigate.  That tailboom clearly folded before anything else happened. The pictures of the tail clearly show a clean fracture aft of the attachment point.

birds or bird hit pitch link or links and blade sailed into the tailboom

https://data.ntsb.gov/Docket/?NTSBNumber=ERA25MA171

9.0 Examination and Bird Strike Findings

During examination of the fuselage and rotor blades, main rotor blade foam

core pieces and a severed bird wing were discovered on the ground and on roof

tops about 2,000 feet northwest of the wreckage recovery site, a specialist from the

Smithsonian Institution’s Feather Identification Lab (National Museum of Natural

History) was invited by the NTSB to conduct sampling of the wreckage to identify

potential bird remains. Additional sampling of the main rotor blades was conducted

by the Feather Identification Lab at the NTSB Materials Laboratory. Bird remains were

discovered

Big fat bird hits Horizontal stab near winglet, causes T-boom to snap off 13 inches from attachment ring, That force sends rotor disk 90 degrees from direction of flight in the vertical axis.  The enormous aerodynamic forces on spinning rotor disk acting like a drag chute rip the entire roof deck, xmsn, head, main rotor system off in one solid piece.  The rest is history.

https://www.youtube.com/watch?v=sHg0l0v3t5c