How do you beat the helicopter mission on sniper assassin 2

The helicopter mission on Sniper Assassin 2 is level 9 (sucker). It is just hitting 2 very small targets, with a recoil when you shoot.

As you near the building, the helicopter will land on the roof of the Microhard Corporation. The door at the left of the roof opens and the 2 targets come out. You have time for maybe 2 shots at the first guy and possibly 3 at the second guy as your copter backs away. You don't get another chance to shoot them.

It may be possible to stabilize your shooting by firing again immediately after killing the first guy, because your gun will kick up anyway. Keep trying because you can still get the second guy as your sight of him is lost. If you can't get them, you can jump to level 10 with the level code "beach party."