I was listening to the song and watching the slide show and I started thinking.
Being on the firing line means you must be committed and fight even if you're afraid. I relate to this easily because I have been on several in my profession as a police official.
You can't walk away without taking the risk of being shot in the back.
And walking away means you are leaving others still on the firing line vulnerable because you left an open space for the enemy to penetrate.
It also means that you leave others to fill that space which will result in them having to do more and to work harder to ensure all the openings are covered.
It is so important to be faithful and stay where God placed us to be. If we don't and decide on our own to join another line where there is no need for us, then what we do may be fruitless.
We must obey God at all times!
Thanks for posting, I find that as I read and listen I get stretched spiritually and grow in areas that I never thought of.
Blessings!