
Jeffe |
Why wouldn't it work,
Cleave (Combat)
You can strike two adjacent foes with a single swing.
Prerequisites: Str 13, Power Attack, base attack bonus +1.
Benefit: As a standard action, you can make a single attack at your full base attack bonus against a foe within reach. If you hit, you deal damage normally and can make an additional attack (using your full base attack bonus) against a foe that is adjacent to the first and also within reach. You can only make one additional attack per round with this feat. When you use this feat, you take a –2 penalty to your Armor Class until your next turn.
In the definition it says a single swing.

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Why wouldn't it work,
Cleave (Combat)
You can strike two adjacent foes with a single swing.
Prerequisites: Str 13, Power Attack, base attack bonus +1.
Benefit: As a standard action, you can make a single attack at your full base attack bonus against a foe within reach. If you hit, you deal damage normally and can make an additional attack (using your full base attack bonus) against a foe that is adjacent to the first and also within reach. You can only make one additional attack per round with this feat. When you use this feat, you take a –2 penalty to your Armor Class until your next turn.
In the definition it says a single swing.
Since you are making a separate attack role, the "single swing" bit seems to be flavor text.

Quantum Steve |

In the definition it says a single swing.
Furious Focus reduces the penalty on the first 'attack' not first 'swing'.
Furious Focus (Combat)
Even in the midst of fierce and furious blows, you can find focus in the carnage and your seemingly wild blows strike home.
Prerequisites: Str 13, Power Attack, base attack bonus +1.
Benefit: When you are wielding a two-handed weapon or a one-handed weapon with two hands, and using the Power Attack feat, you do not suffer Power Attack's penalty on melee attack rolls on the first attack you make each turn. You still suffer the penalty on any additional attacks, including attacks of opportunity.
The additional attack in Cleave is quite explicitly a separate attack.