life believing in their heart and soul that that is trayvon martin's voice. >> reporter: is that what you asked when you asked, and i believe you asked this of trayvon's mother, that he shopped to hear his voice? >> how could she not? we know, being able to analyze it in the cold light of day, we know that one of two things were evident on that tape. trayvon martin was screaming for help and george zimmerman murdered him. two, george zimmerman was screaming for help because he was being battered by trayvon martin and he reacted to that battering by shooting trayvon martin. if you're the mother, the friend, the father, how could you not want that to be the first alternative rather than the second? >> it's interesting, martin, clearly in those cross-examinations, particularly with trayvon martin's mother, he doesn't want to be perceived as the bad guy during the trial. >> reporter: what he wanted to