Lyric discussion by aaronmh92 

Cover art for Walk the Line lyrics by Tallest Man on Earth, The

So I could be completely wrong, but I feel this relates to the fall of an angel? Maybe the most famous of them? If you read Paradise Lost, he really becomes personified as a tragic fall rather than merely being a purely evil creature.

The "I ain't gonna walk the line" referring to disobeying God? Followed of course by the "Please, don't shoot me down" then the falling and defeat and stubbornness of "I ain't gonna walk the line."

My Interpretation