If you have done any fighting recently, I am sure you may have noticed a new feature - "Power Attack".
As stated in the picture above, Power Attack literally attacks again 5 times. It expends 5 stamina, and gives you the rewards as if you had attacked 5 times individually:
There is no special function to Power Attack, it just seems like a shortcut to prevent spam clicking and make spending 100s of Stamina points more appealing then spamming attack over and over again.
The downside is that you can not Power Attack iced opponents. Opponents must be alive in order to use Power Attack. If your enemy dies during your Power Attack, all 5 attacks do not go off.
As a result, I'm finding that most of the time my Fight List is dead, so I do not end up Power Attacking anyway! Power Attack is an available option on someone's profile page, but clicking it just ends up issuing a single attack if the opponent is iced.