As usual with this show, the writers are so far offbase, it is like they have never watched any show about law or military personnel. In this episode, the team holes up in a mansion to defend against trained assassins coming to kill their family members and them. They have a "state of the art" security system, yet there is no infrared cameras or night vision cameras to observe the grounds from a night attack. The members of this elite team go into the dark with only their naked eyeballs to search for intruders. They seem to be only armed with their personal sidearms and nothing else. During this state of high alert due to the danger, there are no backup officers and there are loads of stupid actions. The 4 stars are for the rest of the work involved. The writing shows almost zero research in how a trained group would actually defend in such a situation.