Jennings threw a 1-0 pitch that was hit by Mercer and rocketed back at 101 miles-per-hour directly at the left side of his head. Jennings fell to the ground, removed his hat and glove, and immediately attempted to get back up.
He staggered off of the right side of the mound and appeared severely disoriented. He leaned over, putting his hands on his knees, and was eventually helped to his knees by Marlins catcher Jared Saltalamacchia. Manager Mike Redmond and trainers from both teams immediately rushed to Jennings' aid from the dugout.
Jennings was eventually carted off of the field to loud applause from PNC Park fans. While disoriented, he was reportedly conscious, per Sun Sentinel reporter Juan C. Rodriguez. Jennings waved to fans as he was carted off.
(h/t CJ Fogler, @CJZero, for the .gif below)
- Will Green