"How would that affect the outcome once the attack begins?"
At the most obvious level, it may result in the fight never taking place, which is always the best case scenario.
Of course, yes, and amen.
But my question was about how the fact that a defender had not been looking for trouble and who had been looking to avoid, de-escalate, evade, and escape, would affect his needs once an attack had begun.
I contend that it would not.