Photo: The Canadian Press Vancouver police say an investigation is underway after a patient allegedly armed with a knife chased a doctor at BC Women’s Hospital and tried to gain access to a locked nursery as staff ducked for protection. Sgt. Steve Addison says he heard the chilling 911 calls from staff and social workers fearing for the unstable woman, whose child is also a patient at the hospital. He says an officer subdued the woman, who is in her 30s, with a bean bag gun. Addison says getting hit with a bean bag is like being hit with a major league fastball, and the woman was hospitalized for a minor lower-body injury. He says the woman was arrested and charges may include possession of a knife, assault and breach of probation. Addison says the fight unfolded after some conversations at the hospital about potentially restricting access to the woman’s child and getting the Ministry of Children involved.