Revolver.

Lisa judged that she would only have one chance to defeat revolver guy, and if she failed to take it she would certainly end up dead. So Lisa directed her first shots at him.

Lisa's first shot missed and revolver guy started to draw his weapon. Fortunately, Lisa's second shot hit between his eyes, blowing out the back of his head.

Both of the remaining "hostiles" were slow to react, allowing Lisa to get shots of at another opponent. Lisa had but a fraction of a second to pick her next target.

If Lisa makes the right choice she would have a chance of winning. If not she would almost certainly be killed.