From the opening chords of “The Abyss” until that moment, the sold-out crowd of 65,000 had been energized. But this was different — maybe as loud as Allegiant has been in its five-year history.

From the opening chords of “The Abyss” until that moment, the sold-out crowd of 65,000 had been energized. But this was different — maybe as loud as Allegiant has been in its five-year history.