*tames the Thestrals and gains their allegiance* D'awww, they're so cute. <3
..........Uh, hippogryphs? No such thing, hun. I believe they're spelled "hippogriff". :3 So looks like that's a moot point now.
...................................Yeah, it's not in the character of a phoenix to blindly attack anyone. Plus, Fawkes is loyal to and only to Albus Dumbledore and thus would not listen to anyone else unless its own observations and knowledge deem that it has no other choice than to intervene. Which proves to be another null aspect on your attempt to unleash these beautiful creatures (and your made up species) upon my person.