Rebecca Rubin Film and Media ReporterIs everyone on vacation?That would be one plausible explanation behind the great box office slowdown. Although three new movies opened nationwide, none were able to crack the top five on domestic charts and only two — A24’s satirical slasher “Bodies Bodies Bodies” and Lionsgate’s low-budget, vertigo-inducing thriller “Fall” — managed to infiltrate the top 10.It’s even more dire that Sony’s action-thriller “Bullet Train,” which claimed the top spot for the second weekend in a row with $13.1 million from 4,357 North American locations, was the sole film to bank at least $10 million in ticket sales. After two weeks on the big screen, the Brad Pitt-led “Bullet Train” has generated $54.4 million at the domestic box office.