I like the shots where you see it looking right into the camera that is some great footage for sure. I can however see why the bird attacked. That planes profile with the slightly forward swept wing looks very similar to what predatory bids look like just before and during the early stages of an attack dive. Add into that the acrobatic maneuvers you were doing that close to it just before it did attack I am 100% sure it perceived you as a threat.
Just like my quads look like wounded birds after I do a power loop into a dive then fly low with random direction changes. Them hawks are like