No, you're flat out wrong, the bat is moving in a rotational motion and increasing in speed as it rotates because the wielder won't be putting any stopping force until they are past the point they intend to strike. This rotational motion, where the farthest point from the fulcrum (shoulder) has the most force. Meaning if you are in range, the farther out you are, the harder you get hit. You must be able to get out of range in order for backing away to be effective, otherwise you get hit harder.

You're only correct if it's thrown, and if you're this close, it won't make a difference.

In this specific case it's better to move in. Even better if the fist ends past your back.

By all means do try your "elementary physics" in real life, I beg you. Film it too if possible.
Not american btw, nor easily offended if that was the point.

Call.

show me the elementary school science experiment that demonstrates whatever unspecified physical principle you pointedly didn't refer to