HOUSTON—Rapper Travis Scott said in an interview that he didn’t know that fans had died at his Astroworld festival in Houston until after his performance. In a lengthy interview with TV and radio personality, Charlamagne Tha God posted on YouTube on Thursday, Scott described from his perspective what happened at the Nov. 5 festival that left 10 people dead. “It wasn’t really until minutes before the press conference until I figured out exactly what happened. Even after the show, you’re just kind of hearing things, but I didn’t know the exact details until minutes before the press conference,” Scott said. He said he paused the performance a couple of times, but he couldn’t hear fans screaming for help. “I stopped like a couple of times just to make sure everybody was OK,” said Scott. “I just really go off the fans energy as a collective, you know? Call and response. …