Simple - HOLD YOUR FIRE.
If you were really in a warzone, you wouldn't keep firing when your squadmates enter the line of fire, right?
Just be careful out there - this game really isn't about just keeping your finger on the trigger
In a warzone I would trust my squadmates wouldn't be dumb enough to sprint full-speed between me and my target when I already engaged him at a distance less than 1km. This is what NPCs are doing in Elite though.