I then get them saying “oi, why did you rewind it!”

That makes sense. For extra context, the balcony its attached to is a gantry only for sound engineers, Containing only the lights and equipment etc. Audience is only below.

Image is not flipped, I had to turn away from the stage to see this, so I suppose if unfurled it would correctly face the audience when they look at the stage.

Ohh a banner. Right, that makes sense. I thought it might be some sort of pyrotechnics.

So you’re thinking “kick out” is just what the banner is saying eg name of a band etc.