* Every time Vincent pulls a BigDamnHeroes.
* Cat in the season 2 opener. Her boyfriend's been captured, her only ally is dead, and she knows she should be next on Muirfields hit list, but is still breathing for some reason that she doesn't know. Most people would react by shutting down, panicking, bursting into tears, or some combo of the previous options. Cat simply looks around, grabs a defribulater, and uses it on Gabe, making it clear that he doesn't get to die yet.
** "Come on, damn it. I need you alive."