"I felt it in the back of my lat area, down underneath the armpit," Scribner said. "It's been tight down there, and just on the last pitch there to Trout I felt it grab on me a little bit."
Scribner said the area has been tight for a few days. Initially, the discomfort was more near his trapezius, but over the past few days, his lat area has bothered him.
He tore his lat in July 2011 while pitching for the Padres. The injury affected him for three months and he rehabbed for three more, so he didn't pitch again that season.
Scribner said the pain this time around never reached the level it did that time. He knew he had to come out of the game, and he expects he might have done more severe damage had he faced another hitter or two.
"I think I got it before that point this time," Scribner said, "but it was definitely going down that road."
Trevor Hass is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.