If the cops thought a serial killer was going to be at a concert, they may have the artist cancel the show. They would 100% would not use it as a trap to catch him.
Then the story line goes down from there.
This is the worst M Night Shaymalan movie ever. Clumsy, ridiculous script and amateurish direction.
But hey, Knock at the Cabin was brilliant.
Even the best baseball players don’t always hit a home run when they are up at bat.