The man behind him with a gun is Gord himself (or we ourselves). Of course for the women it's "woman".
Meaning: You may look one day and see yourself in a way that you might not recognize. It may result in your own destruction.
In other words,if you let things get to you to deeply,like he seems to be doing in the song,it could send you into a darker side of yourself.
That's my defenition.