It took me a while to figure this out and I even gave out some bad info online (hope he reads this). To get a guaranteed power blow, first make sure you are below 50% HP (your life bar will glow red), then get a critical burst, then charge the power blow (as stated above). It's no wonder you don't see many of these.
Haha! I see I'm not the only one who reads "power blow" that way. Who here's a power blower? Lolif you power blow someone long enough..they'll eventually do a critical burst.![]()