The most common answer would probably be to do the opposite of what you normally would. I, however, think that my mirror image would be expecting that, so I'd proceed like it were anyone else. (Tactics subject to change mid-battle if deemed necessary.).
Say his shoes are untied and run when he realizes they really are, like always. :).
I would break the mirror. It's not like the image could get out of it anyway.
I would make sure that she wasn't me, then I would shoot her. Quick, easy, effective.
Since my mirror image is me.. and I hate violence especially fighting I do believe there'ld be no attacking. We might start an interesting conversation which is a lot better anyway. I love my face as is, so no one would be attacking nothing!
I would get out of the way and let her fall flat on her face or in to a wall.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.