I've a sequence of seven photos showing the two of them (and then they dropped below the treeline).
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The photo above is the redtail's uh-oh moment and the realization that there's trouble overhead.
Next, the hawk tries to maneuver away, and it looks like both birds are flying vertically.
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The redtail cannot fly faster than the raven.
Incidentally, considering how both of them are approximately the same size, I'm assuming that the redtail is a male. (A female redtail would be larger.)
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Both of them are upside-down!
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And then there's another race.
