How come Superman could stop bullets with his chest, but always ducked when someone threw a gun at him?

I have seen it happen! :PHow come Superman could stop bullets with his chest, but always ducked when someone threw a gun at him?because in case being pistol whipped would hurt more then being shot.How come Superman could stop bullets with his chest, but always ducked when someone threw a gun at him?Also, if you look carefully on the movies you will see that Superman had dental work.How come Superman could stop bullets with his chest, but always ducked when someone threw a gun at him?Superman can't walkHow come Superman could stop bullets with his chest, but always ducked when someone threw a gun at him?
It's just the body's natural reflexs.

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professor layton