Then she's passing him. >> reporter: then, frances said, bill dropped back to her right. >> and i'm passing bill. i see bill from my passenger window. and she brakes. and i brake. and i heard something. i heard a thump. >> reporter: that piece of granite again, frances thought, and she continued to chase after bonnie, still hell-bent on confronting her. suddenly, bonnie made a u-turn. >> and as she makes a u-turn, i make the u-turn. she takes off. >> i got a black escalade and a black range rover they're traveling at high rate of speed. i don't know, 90-100 miles an hour that black range rover...