Wasn't it blown up on purpose because they couldn't get enough lift, due to the walls, to fly out when the job was done?
I think it suffered some damage before landing (supposedly it landed hard too). Some are thinking the tail hit the wall of the compound, which would surely make one hell of a mess out of a tail rotor.
Not surprised to see a new stealthier tail rotor first get employed on helicopters for SOCOM use. Makes sense, not from a radar stealth point of view, but a noise and IR POV. AFAIK they were already flying under the radar.