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