weekends, depositions at night. >> reporter: most of this final day in the defense case focused on the testimony of an expert on the use of force. >> if you haven't been able to successfully win the event in the first 30 seconds, you need to change tactics. >> reporter: who said zimmerman had no other options but to shoot trayvon martin because he wasn't adept at fighting and felt his life was being threatened by the teen. zimmerman has pleaded not guilty to second-degree murder saying he fired in self-defense. >> i don't know what else he could have done based on his abilities because, not to be offensive to mr. zimmerman, he doesn't seem to have any. >> reporter: under cross-examinati cross-examination, prosecutor john guy used a foam dummy to question where zimmerman's gun was located when he pulled it. >> if this mannequin were carrying a firearm on their waist where would the gun be in relation to me? >> would be at your left inner thigh. >> right here, right? >> yes. >> reporter: later -- >> may i use your doll a moment?