In the top of the 4th inning, Marlon Anderson and Ryan Church collided in shallow right field. Church doesn't "remember anything about anything."
Both players were attempting to track down an Andruw Jones shallow pop and collided. Each player remained on the ground for a significant period of time. When Church came to his feet, he wobbled around and had trouble standing.
He was taken to the hospital for a CT scan, and was diagnosed with a concussion. Anderson is said to have a contusion on his chest. Adam Rubin quotes Anderson as saying, "No blood. Soon as he hit me, though, a little bit of what I had for lunch came out of me."