Nice work, Sparrowhawks are total lunatics.
One time I was out in the fens working my short-eared-owl project, and sparrowhawk got involved in an aerial dogfight with a meadow pipit, I was sat in my car watching this meadow pipit flying for it's life, the meadow pipit then flew right towards me, went in through my car window and out of the other side then underneath the car, angry sparrowhawk lands and starts parading around the car looking for it, after a few seconds the fight continued off towards some hay bales, I have no idea if it escaped or not,