No bird strikes at 20,000 feet. Prop or turbine failure seems more likely. Failure of turbine rotor and containment shell cutting hydraulic lines like UA 232 (a DC-10) in Sioux City, Iowa July 1989?
yep no birds... something happened at altitude and happened fast and catastrophically... from the pic i saw it look like it came straight down, mostly intact. i mean flat not spiralling down...
Eagles can strike that high... but your right. Probably an engine failure. Something big that took out other systems rapidly.