I had a question about Coup de Grace.

It says you can use it against a helpless opponent. Helpless opponent is defined as "Paralyzed, held, bound, sleeping, unconscious, or otherwise completely at an opponent's mercy." 

Now, if I was invisible and behind an unwary opponent, could I use a Coup de Grace because he'd be 'completely at my mercy'?

I've read things in places that this might indicate a yes, but I wanted a definitive answer.

Thanks!

EDIT: I was just using invisibility to set the stage. The point was that the victim has no idea I'm there. Invisible, or not, I just wanted to know if this situation counted as a coup de grace.


Question: How to find the files in magento directory
Answer: Check this file out:

app/design/frontend/base/default/template/checkout/total/tax.phtml