have been unavoidably detained by the world

In her short story collection The Girl Who Heard Dragons, Anne McCaffrey (yes, of Dragonriders of Pern fame) wrote a short story called Euterpe on a Fling. It's not a famous story, but the basic premise as I remembered it was that an opera singer sang a performance one night that was simultaneously broadcast on the radio, in the early days of the radio. And the audience in the theater was enraptured by the performance, and could not stop talking about how amazing it was even years later. The radio audience, however, apparently heard a disastrous performance from that one opera singer, to the point that the radio station actually stops the live broadcast. The opera singer dies that very night and the mystery is never solved. The implication I took away from the story is that there was something magical, otherworldly or at the very least hypnotic coming from the opera singer that night. Something truly special that only the audience experienced, something that didn't, or couldn't translate over radio. Every person in the audience remains grateful they saw a once-in-a-lifetime performance. Everyone who heard the radio broadcast remained hopelessly confused.

So. Let's talk about Anthony Boyle in Harry Potter and the Cursed Child. ( cut for spoilers )