Code:
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A group of WeakAuras to use Focus Fire, based on the following:
1) If BW up, use Focus Fire if under 20 focus, and BW has 2.5+ seconds left, and frenzy Stacks = 5
2) If TED up, use Focus Fire if under 25 focus, and Frenzy stacks = 5
3) If BW is above 10 seconds of coming off cooldown, and 5 Frenzy stacks, use Focus Fire.
4) If your Frenzy buff is about to expire, use Focus Fire.
The reasoning for the BW/TED ones is that Focus Fire guarantees a 100%+ dmg bonus to your pet's next Basic Attack, the damage gained is higher than the Cobra Shot you'd otherwise have. The 3 second thing is because of pet Basic's 3 second cooldown, e.g. if you use it @ below 3s on the TED/BW, and your pet has just used its basic attack, you will not have TED/BW for the basic attack.