>> now musto finds him in the midst of oncoming traffic in the center of an intersection. >> i went to get up and i saw the light turn green, and people didn't want to miss the green light, so they went on through the intersection. no one offered help. >> dazed and disoriented musto dodges oncoming traffic. >> one lady that was parked next to my patrol car when this whole thing happened, i could see her mouthing to me, "are you all right?" >> i'm all right. >> he returns to his patrol car and immediately pursues the biker. he also radios dispatch. >> i just got drug by a motorcycle. high rate of speed. north on i-95. >> in this line of work you hear signs. you know, people who you've worked with. that just didn't sound normal. >> deputy will ferrell is a mile away when he hears his friend's call for help. >> you start hearing it in his voice. you start hearing that adrenaline, you know, tired sound. >> white motorcycle. black, leather jacket. hispanic rider.