During the fourth inning of the Arizona Diamondbacks/New York Mets game on Sunday, Arizona pitcher Jason Marquis struck Mets catcher Josh Thole with a pitch. Upon impact, both players fell down into respective heaps.
Why? It turns out that in the prior inning, Marquis' leg had been hit by a ball off the bat of Mets centerfielder Angel Pagan. The force broke the fibula bone in the pitcher's leg, but he decided to keep playing.