The more damage you do in comparison to their HP (I think), the greater the knock-back. Normal attack "stuns" the enemies momentarily and heavy attacks knock them back. Generally speaking, I've found that the two-hit combo is only truly effective if the second attack is heavy. In my experience, the stun from a normal is not usually enough to get outa the way.
With practice, you will learn to see when they start their swing and you can step away. Just as they complete their swing, step in and attack again.
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