by the way, the defense, j.j. mason was an expert in guns, the kind that fired bullets.ow about a crossbow? so how, asked the defense, could anyone rely on this expert's opinion? time for the defense to make its own case with some courtroom drama. >> judge, i'm going to ask the court to indulge me with one more physical demonstration. >> defense attorney gregory turpan would show right here in court how the weapon could have fired accidentally. the right decision? well, maybe not. >> actually, may i ask if i could have the witness step down while i do this, please? mr. mason. >> just don't mess it up. i assume you've done this before? >> judge, yes, sir. >> mr. mason, this is how it would be drawn back to begin with? >> that's correct. >> if i can ask you to tell me -- bear with me just a moment. judge, i'm going to try one more time, then i'm not going to take up any more of the court's time. >> the demonstration was an embarrassing bust. >> judge, thank you for the court's indulgence. i won't take up any more time. >> now the defense had one blockbuster witness left. >