One it is illegal to discharge a firearm while under the influence of alcohol in the state of GA. You do not have to run from a threat in the state of GA either.

Honestly if you got to your car then leave, you would be a moron if you got to your car before him and didn't drive off if all you were threatened with was a knife and bottle. Why even put yourself in a position where you could be charged if you don't have to. If your friend is being attacked you could use force. Seeing how everyone has been drinking I would use caution with your actions. Rememebr just because you are arrested does not mean the charges will hold up but why take that chance.

By the way this is the wrong place to find out this information.