HBO has acquired the Oscar-nominated documentary short “When We Were Bullies,” which will premiere on March 30.“When We Were Bullies” focuses on director Jay Rosenblatt (“Human Remains,” “Phantom Limb”), as he tries to track down people from his 5th grade class to interview them about a severe bullying incident that occurred at their school 50 years ago. Using a mix of archival footage, animation and modern day interviews, Rosenblatt both reconstructs the event and comes to terms with his own sense of shame about what occurred.“Everyone carries pain,” Rosenblatt narrates in the trailer for the short that HBO released. “Yet through that pain, I can see yours.”In addition to directing, Rosenblatt wrote, produced and edited “When We Were Bullies.” The short is one of five nominees in the best documentary short category at the 94th Academy Awards.