What kind of suspense is created in the opening scene?

The first scene does not characterize the individual characters or the audience, but it begins at the beginning of a screening of a theatrical piece, and it is clear that the players are part of an ongoing, larger narrative, so the reader is already wondering what story we are in the middle of. When the lights go out and the shots are fired, the reader has no idea what is happening, except that it is happening in a prison, and that the audience is suddenly in danger.