Hopefully, this is just a HUGE non-story, and Brad Bergesen is simply a few days behind the rest of the pitchers at Spring Training. According to MASN's Roch Kubatko, Brad apparently had not yet begun throwing off a mound in his off-season work, and was summoned to Oriole Park at Camden Yards to film this spot.
He tweaked his shoulder, and felt pain, and alerted the training staff soon after once the pain didn't subside. He's been a bit cagey about the injury since it happened, and swears he will be fine for Opening Day. Here's hoping he is right.