[RetLT]

Picture this:

Helicopter #1 is 5 hexes from 3 enemy infantry units
Helicopter #2 is also 5 hexes away.

Helicopter #1 moves to 4 hexes away and is targeted (units turn towards it) but is not fired upon by the infantry units.

Helicopter #2 will fire on one or more of the infantry units on its own.

I have only seen this against infantry units. I have not seen unwanted fire against vehicles.

I have seen this take place with both attack helicopters and transport helicopters.