Norris took Moreland's ball off his arm after failing to get a glove on it, and was in immediate pain as head athletic trainer Richie Bancells and Showalter came out to the mound. He stayed in after a few warmup pitches, but served up a three-run homer to the following batter, Adrian Beltre, who delivered his second long ball of the night.
"Pretty sore," Norris said of his forearm postgame. "You never want to get smoked by a comebacker but the trainers will look at it the next couple days and get rid of the swelling as best I can.
"You don't know where you want to get hit, but I guess the forearm [is an OK spot]. Like I said, I got some muscle there, I can flex this. You never want to get hit there but it's part of the game as well."
Norris, who had allowed just one home run over his previous three starts coming in, tied a season-high in runs allowed (5) and a season low in innings, turning in his worst outing since his season debut on April 5.
Brittany Ghiroli is a reporter for MLB.com. Read her blog, Britt's Bird Watch, and follow her on Twitter @britt_ghiroli. This story was not subject to the approval of Major League Baseball or its clubs.