Task: Question Generation
Input (English): Passage: On October 29, 1993, Beatrice High School student Charlie Grimille is accidentally hanged and killed after a prop malfunction during a presentation of the play "The Gallows." His parents, along with the whole audience, witness the tragic event.
Twenty years later, on October 28, 2013, the school attempts to put on a new performance of "The Gallows." Reese Houser is excited, as this gives him a chance to grow closer to his crush Pfeifer Ross. His friend Ryan Shoos is dismissive of the play, and comes up with the idea to vandalize the set. Reese is reluctant to take part, but agrees when Ryan promises that he'll be able to console Pfeifer afterwards, giving them a chance to kiss.
Later that night, Reese, Ryan, and Ryan's girlfriend Cassidy Spilker sneak into the school, only to run into Pfeifer, who saw Reese's car. Knowing they cannot vandalize the sets with Pfeifer there, the group tries to leave, but finds that they have been locked inside, and there is no cell phone reception. Disturbed, Cassidy admits the trio's real reason for being in the school, which angers Pfeifer.
As the group tries to look for a way out of the school, they find news coverage of Charlie's death that includes an interview with his girlfriend Alexis. They also discover that Charlie was not supposed to have performed that day, and was only on stage because he was the understudy for the main actor, Reese's father Rick.
The group becomes separated when Reese runs off with the camera, with Ryan being left alone. As he searches for Reese, he sees various things, such as a half finished plate of food, a cup of coffee, a hidden room with a mattress and bed frame, and what looks like a body hanging from above. When the group is reunited, they hear footsteps above them that stop above Cassidy. She is then yanked into the air by seemingly nothing, leaving her with burns on her neck that look like rope burns.
Output (English): What tragic event do Charlie's parents witness?