The helicopter crashed due to pilot error by not putting the nose of the helicopter "deeper" (nose first) inside the compound interior yard. Of course, the US Military isn't going to admit that there was an error during an elite SEALS mission (thus, they blamed it on mechanical failure, not pilot error). As a result, the pilot didn't clear the rear tail boom of the UH-60 aircraft during his landing approach and it clipped the high concrete fencing and broke the tail section completely off at mid-point just before landing. That's why the rear portion of the tail rotor area was undamaged because the tail boom was broken off at mid-point (not end-point).
It does appear that the tail rotor blades were "encased" in a protective circular shroud. It may or may not be because of stealth, but rather just as a protective measure that the bare ends of the tail rotor blades aren't exposed to catch on things such as wires or tree branches when coming in close quarters. The protective tail rotor shroud encasement would also likely help reduce tail rotor noise and make the overall aircraft somewhat quieter (although not by much).
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