I think the most interesting part in the article is this piece of Grant Morrison-esque detail--the first cops on the scene called a special unit of the NYPD for help:
[T]hey saw Brea gripping the sword, and a trail of blood leading to a closed door.
They retreated and called Emergency Service Unit cops, although a supervisor remained at the door and kept his eye on the suspect, which the NYPD said is standard practice.
ESU cops are "trained psychological technicians. They have additional equipment that enables them to perhaps better protect themselves," Police Commissioner Raymond Kelly said.