This incident excited considerable public and media interest in Mexico City where it ocurred. The footage we show in the extras was but the first night of four nights where the footage was examined in ever greater detail and additional matters came to light. It is an absolutely fascinating case study on many levels. Forgive me the hook, but we go into this in further detail on the DBMA Association website
In answer to your question about shooting the perps:
1) Although it was not apparent on the first night this footage was broadcast, subsequent analysis revealed four shots
2) Also broadcast on one of the subsequent nights was a piece on the urine poor quality of police pistol training. It was basically zero, and all bullets had to be bought by the individuals officers-- whose salary is under $150 US a month.