>> and from what you could tell it seemed completely true? >> yes. >> reporter: testimony later from a police officer who was one of the first responders on the scene seemed to align with zimmerman's claims. >> was his jacket pushed up in any way? >> i don't believe so. >> did you see any tears in his jacket? >> no, sir. >> what, if anything, did you notice about the condition of his jacket? >> the back of it was better than the front of it, and it was also covered in grass. >> martin, the last witness of the day was a physician's assistant that testified zimmerman walls familiar with mixed martial arts. what was that all about? >> reporter: yeah, very interesting because this had been a day that looked like it was going in the defense's directional. then all of a sudden this comes up. why does a physician's assistant start talking about mixed martial arts?