An off duty cop jumps into action to nab a woodbe thief almost missing a date for his own wedding. Good evening, im elizabeth cook. Im ken bastida. Kpix 5 on the sergeants date with destiny. Kit . Reporter yes, he was on a moving bart train. He has his beautiful fiance at his side and he said doing nothing was not a option. So much for a quiet wedding. I know. Reporter the San Jose Police sergeant is more of a lover than a fighter. Sometimes he is both. Just a regular guy, happy to have a job and such a gorgeous partner. Reporter frederick and his fiance paid 75 for a non refundable appointment at city hall. As their train pulled into oakland, this woman Jennifer Davis grabbed another persons purse. In the back of the train she was quickly surrounded by an angry mob, throwing kicks and punches. Someone tried to zap her with a taser on a day that was suppose to be about love. Dont get involved. And then the whole thing just disappeared. Like its gone. Reporter the 59 200pound cop is a f