Straight away it is obvious that this show will be packed with tense moments. "There are two times of emergency," Britton starts off as the voiceover in the trailer. "The first kind is the one we all have every day. Then there's the second kind of emergency. The kind that comes without warning." Then, we see Krause and his team responding to a woman being slowly asphyxiated by her pet python. Probably not something most of us deal with every day, but the first responders seem pretty calm.