Proper Etiquette

Whats the proper etiquette for this situation?

You're sitting at a bar minding your own business when the bartender gives you a drink you didn't order saying its from the woman flirting with you across the bar. You don't want the drink, but you don't want to offend the lady by sending it back, but you also don't want to give the wrong impression that you're interested by accepting it.

Ask someone around you if they want a free drink and give it to them?

Or better yet, if you see a hot girl you like, tell the bartender to give it to the hottie and say it was from you. That way if you get rejected you are not out of pocket.

Tell the bartender to send it back. The point of this flirting is to see if you're interested. The proper thing to do is give a clear yes or no. Denying the dring is not rude it is merely the course of two options.

You can't send a drink back.  Chances are, it's a mixed drink, meaning they'd just toss it down the drain.  Just accept it, and drink it down ... then pull out your sawed-off, and move from patron to patron, pulling the trigger methodically and calmly, blowing a large hole in each sternum or skull presented.  You are a god, you cannot be stopped, and you decide who lives and who dies.

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Deny the drink but tell the bartender to say thanks to the lady anyway.