Looks a bit pap to me
Don't marksmen breath out to fire, not breath in?
He got shot through a steel girder as well?!
Breath in to steady themselves I thought.
. Take a deep breath in. The front sight will dip. Let your breath out, watching the front sight rise until it barely touches the bottom of the bull’s eye - now hold your breath (“Respiratory Pause”). You have just used a natural act - breathing - to establish your correct elevation. (Don’t forget to get your NPOA!)