Being thrown and mix the marshall arts. >> what you saw was the person on top in an mma style straddle position, correct? >> correct. >> that was further described, was it not, as being ground and pound? >> correct. >> reporter: good also testified about one more key question, that voice screaming for help in the darkness he believes belonged to zimmerman. >> the voice screaming for help however many times that you heard it, it was just one person's joyce? >> when i heard it outside? i believe it was just one person's voice, yes. >> and you now believe that that was george zimmerman's voice, c...