BALTIMORE — An injury-plagued 2015 season got even worse for the Ravens in the first quarter of Sunday’s 16-13 win over the St. Louis Rams. Starting running back and 2014 Pro Bowl selection Justin Forsett was lost for the rest of the season after suffering a broken right forearm in the first quarter. The veteran back was slammed to the turf by Rams defensive tackle Aaron Donald, and television replays showed his arm bending in a grotesque manner. Forsett’s right forearm was immediately placed in an air cast before he was helped to the locker room. “I kind of looked over his body and just saw his forearm and said, ‘OK. I’m not looking at that anymore.’” said quarterback Joe Flacco, who also suffered a season-ending knee injury in the fourth quarter. “I didn’t see much, but I knew it wasn’t good. It’s a shame, but we gutted it out and got a win.” The Ravens immediately announced the severity of the injury as their starting offense has now lost its starting quarterback (Flacco), top two receivers (Steve Smith and Breshad Perriman), top two running backs (Forsett and Lorenzo Taliaferro), and starting center (Jeremy Zuttah) to season-ending injuries in 2015.