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As far if I understand it, "IsUsableAction" would only return 0, 1 when "Keg Smash" is on Cooldown but the player has enough energy to use it.
The function of the addon is to predict how much energy the player will have when "Keg Smash" comes off cooldown and, if the predicted value is above 80, inform the player that he can use "Jab" (which costs 40 energy) and still have 40 energy left the moment "Keg Smash" comes off cooldown (so the player can use "Keg Smash" immediately when it comes off cooldown without waiting.
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