My situation puzzle plan

Steemit is a social platform and I hope to come up with the same things that can both interact with people and meet my expertise. I'm going to come up with an original situation puzzle series that will allow you to have more interaction with steemit, not just the author Output. As for the situation puzzle game, we can check the wiki. Here is my first situation puzzle.
Sea situation puzzle ------------------------------------------------ --(accident)
A performer with 5 years of experience died in a performance.
Only hear the audience calling: tragedy, how can an accident occur
The police found a pair of broken headphones, a broken cell phone and a mask next to the body.
Is this really an accident?
What happened?
Welcome everyone to ask questions in the comment area!