The second window that was broken out essentially doesn’t have sightlines to the concert. If there were multiple shooters in that suite all shooting at the concert, the broken windows would be next to each other. The second broken window, however, does have good sightlines to the two fuel tanks at the airport that had a couple of Paddock’s rounds in them.
Actually the second broken window lines up pretty well with the exits in the rear of the venue. Fire at the stage area to begin killing folks there and setting the crowd into a panicked run for they exit, then start dropping targets as the pile up at the choke points.