The Ravens practiced on the far field today, so it was difficult to take roll call. But it was clear that defensive tackle Haloti Ngata was not present during the portion of practice open to the media. Ngata, who is dealing with a sprained right ankel suffered in last Sunday's victory over the Denver Broncos, has started all 55 games of his four-year career, but NFL teams usually suscribe to the general rule of thumb that an injured player must practice at least once to be considered a...