Dead or Alive 5

For at least all the fighters I've seen so far, their Power Blow is executed by pressing in a direction (usually back or back/down) and holding P+K for a second, and the move will launch without needing to release. To check your fighters specific direction, go to 'view movelist' in the pause menu during the fight, and scroll to near the bottom of the strikes page. One move will say 'POWER BLOW' above the button combination. (Note: You cannot execute these until you life bar begins to flash red, which it does when you hit 1/2 health remaining).

In Zack's chapter, it becomes one of the goals given to you, which means it will give you a more in-depth explination of how they work toward the fight, and executing his during said fight will unlock another title for you as well, so if you want a little extra help try doing it this way.

Another easy way to do this is simply use 2 controllers in a versus fight.

So, I've got this video here. And it's tellin' me all about how to get the "Blow 'em Away" achievement in Dead or Alive 5. I think you might be able to make use of it. So, here, watch it.