I took only the after printscreen (not the before one).
It (the power attack) comes randomly I think. What it said was that you can have up to 5 attacks (consecutively I think), so the feature allows you to save your mouse from your abusive finger!
The aftermath shows how many you have won and lost. (see my orange circle and arrow). Cool huh!
I iced the opponent actually. That is why I think it showed only 2 attacks out of the possible 5.
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