It took no mercy. “Mercy” beat out all its box office competition on its opener Friday, raking in $5 million, according to The Numbers . The sci-fi action thriller — starring Chris Pratt and Rebecca Ferguson, who play a police detective and an AI-generated judge, respectively — will “have you on the edge of your seat,” according to Deadline . “Avatar: Fire and Ash” remained in the second spot, with sales of $1.7 million on its sixth Friday in theaters. In third was the supernatural