TarionzCousin
Second Most Angelic Devil Ever
However, dropping prunes is a free action. 

Except "knocked" is not defined in the rules, only "prone" is. Knocked is basically fluff text. This is a game, not real life, you have to define a term in the game-sense for it to have meaning to the rules.This seems pretty clear to me -- comparing the phrases "dropping prone" and "being knocked prone," it is the person who says they're equivalent who makes by far the bigger logical stretch. When you fall prone, what knocked you prone? Answer: nothing. You weren't knocked prone!
I would tend to say dropping prone does not invoke the benefits of being knocked prone.
I'm not sure I agree - "knocked prone" is involuntary, "dropped prone" is voluntary - the rules are full of distinctions between voluntary and involuntary actions.
So, no, I don't think the terms "drop" and "knocked" are fluff text.