Note: This story contains spoilers from the “9-1-1” Season 6 finale.Filming for the Season 6 finale of “9-1-1” pushed Oliver Stark to the limit, and that’s just how he likes it.The first responder drama took a massive swing with its final episode at Fox, featuring a massive overpass collapse that put the lives of the entire crew of station 118 in danger. A mildly injured Buck (Stark) — who saw his own life hanging in the balance after being struck by lightning earlier this season — got to help rescue his teammates, including performing an elaborate stunt where he repelled back and forth to save people stuck in an ambulance hanging off the collapsed piece of highway.“That was one long take!” Stark shared with TheWrap.