Instaspawn-interdictions from an FAS, usually if you evade the interdiction they drop out and don't bother you anymore. I dropped down into a signal source to scoop some cargo and of the same FAS drops in and opens fire without warning, I boost away and charge my FSD but railguns/plasmas (can't remember which) dropped me shields and the missile spam got a lucky shot in.
Since I was travelling at close to full speed I just drifted away and the FAS dropped off my scanner.