INGLEWOOD, Calif.—Sean McVay’s excitement over the big-play potential the Los Angeles Rams have with Matthew Stafford finally got the best of him on Sept. 26. The Rams had a 14-7 lead against the Tampa Bay Buccaneers early in the third quarter when they faced third-and-10 at the LA 25. McVay dialed up the perfect play that would be the defining moment in the Rams’ 34-24 victory over the defending Super Bowl champions. McVay called for a pass to DeSean Jackson on a go route. Jackson easily ran by cornerback Carlton Davis III, caught it at the Buccaneers 30 and then zig-zagged his way for the final 10 yards and into the tunnel. He was eventually greeted by the exuberant Rams coach, who ran down the sideline to celebrate his team going up by two touchdowns. “I think my hamstrings are already sore. I probably pulled them both,” McVay said jokingly. …