Let's say you are in a PS and you have little Ki left. The beam is getting near you and you start hitting your LMB like crazy!
I've tried it and this is what happens:
And i won the PS even if the beam was just about to hit me!
What do you think about it?
The pump balls that you fire into the PS are very weak if you only hold the mouse button down very shortly. You have to charge the pumps like any other attack. The more energy you pump into it, the more power you will give it.
Also, if you wait for a pump to come real close to you, then release your own, you can get a speed boost. So it pays to take a risk.