I have a man-eating Onyx ball- Black Pastel/Het Red Axanthic. Its not just a crazy insane feeding responce with him, it's hissing, and whipping around snapping/chewing like Jaws on the back of the boat. He flails around like crazy when you pick him up. Takes quite a while before he just relaxes into a calm, but strike ready posture.
I have heard of other Red Axanthic types with a feed responce like no other. I really doubt it came from the Black pastel half, my Black Pastel girl is an absolute ham. I agree on the line, not color aggressiveness.