Aircraft propulsion is inherently low jerk which makes it difficult for a conventional single mass helicopter to evade anti-aircraft fire.
The solution is to design a helicopter in two sections connected by an hydraulically operated actuator, preferably with the center of the thermal image out in the middle of nowhere. When receiving fire a controller jerks each section off the mass of the other, if necessary in any or all 3 dimensions.
The airframe or rotors may need to be beefed up a little and the personnel secured because it'll be a rough ride for the pilot & crew until they can find a safe altitude or location.
But it's better than being a low jerk low acceleration target.
Bret Cahill