This is a Get Out of Jail Free episode for the writers. All their rules limiting their creativity are lifted; they are free to write whatever they want to write. There is very little anatomy in this episode; very little medical story except just enough to hold the story together.
I did not like it when Bones did a story like this and I don't like it here either. I think this is an indication that the writers are getting desparate for material. I later gave up on Bones. I am not so quick to give up on Grey's Anatomy but if this episode is an indiacation of the writers becoming desperate for material then I might have to give up on this show too.
The hospital shooting episode disappointed me. In that episode, the police knew where the shooter was but they did not go after him and many of the shootings happened after that. That episode was also not written well.