If you miss the Deathstroke fight, start a new game so that you can face him for the “Point Counter-Point” achievement. In the fight, press Y to counter each of Deathstroke’s attacks. Attack him normally, which may trigger a quick-time event. Press the counter button when it appears on the screen during the quick-time event. If you get hit at any point during this fight, restart the battle and try again.
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