It may have played out at the hospital because the hospital has a lockdown protocol in place. It'a done so quietly, that most people wouldn't know what is happening. Thirty minutes really isn't long to get in, make and arrest and get out. It's a huge hospital.
Funny story from our hospital: We had a situation in which a man in the waiting room was carrying a gun. The hospital went into lock down. Calmly and quickly, one by one, all the people in the waiting room, except the gun guy, were moved to safety, oblivious to the danger. The OPP contacted the closest officer to attend to the situation. When the local undercover police detective's phone rang, he didn't even realise that he was isolated in the hospital waiting room and that the hospital was in lock down. He was the gun guy.