BALTIMORE — The Baltimore Ravens are angry and calling for a review of the rule book after watching Joe Flacco being helped off the field, bleeding and disoriented following a late hit.

Flacco sustained a concussion Thursday night against Miami after he went into a slide designed to prevent the quarterback from being tackled. The Ravens were off Friday, and provided no update on the quarterback’s condition.

Dolphins linebacker Kiko Alonso crushed Flacco late in the first half Thursday night, forcing his exit in a game the Ravens would win 40-0.