You make two melee or thrown weapon Strikes. If you Miss with one or both of the Strikes, you can make a third Strike. If you Hit or Critically Hit with both initial Strikes, you can use your Reaction to make a third Strike.
You gain a +2 Bonus on the damage roll(s) of any of the Strikes that Hit or Critically Hit.
If you only Hit or Critically Hit with the third Strike, the Bonus to your damage roll increases to +4.