bj, this is about 190's not 109's
And letalis, its not a sure thing that he will evade if he sees tracers infront of him. If I see a spit turning get his guns on me (me on the deck, spit 1-2k above me flying in the opposite direction) I know that I'm safe (flying my P-51 or la-7) that I'm safe if I can survive his inital shot, as he won't have the speed or energy to catch me.
About the only time I would evade is if I see its a 110, speed demon, 190A8, or 4x cannon armed plane, as my chances of surviving his attack, or out running him in the case of the low alt speed demons, drops.