My experience with the American Common Raven (Corvus Corax amer.) is that
the males are more likely to dive on a target. True, I've been bombed by
females when they were nesting, but even then, the male is more likely
to make the attack.
As far as I know, the bombing in question was a recent event too...
Ravens nest in the spring.
Where are you, Paul? It's interesting that your corvid species is called
a "magpie"... Here in the south, there are still a few old-timers who
call pied blackbirds "magpies".