Another season of 9-1-1 is in the books, and to celebrate, Decider sat down with Oliver Stark to unpack Buck’s final two episodes, revisit some Season 9 highlights, and look ahead to Season 10. Before Season 9, Episode 18, “Hearts and Flowers,” aired on May 7, Stark stopped by Decider’s Midtown Manhattan studio to discuss Buck’s reunion with his biological son Theo (Lincoln and Theodore Sykes). We chatted about a potential ADHD diagnosis for Stark’s character, parallels between Buck and Eddie’s (Ryan Guzman) stories, and how the single dad will play a crucial role in Buck’s new chapter. But before the 9-1-1 star closed the door on Season 9, he reflected on a few favorite episodes that were particularly fun to shoot and challenged him to step outside his comfort zone. “It might be the same answer for both.…