A large bird of prey -a kestrel? hovering low over next door. Then a single blackbird rose and `escorted` it away.,
I`ve seen rooks go mob handed but this was a single blackbird-is that unusual??
Two birds of prey hover in the UK, kestrel and buzzard...latter much larger. Neitgher regularly prey on songbirds...buzzard is too big / slow, kestrel mainly feed on rodents, so neither pose that much of a danger to a blackbird. I doubt you'd see a blackbird mobbing a hobby or sparrowhawk in flight :o
I witnessed a blackbird become a sparrowhawk's prey in my garden :'(