Portents and omens have been done. If the rest of the play is as stale, your work will come as a breath of fresh air.
On the godwalk high above the stage, a shining orb begins to slide across the rail, illuminated from within by what's probably another oil lamp, but at this distance passes quite well for celestial fire. The audience oohs and ahhs.
The comet stops, unlikely behavior for a celestial object, but providing the opportunity for it to shower dramatic sparks. From the audience, scattered applause suggests that the dramatic sparks are being appreciated.
Something in Diar's bearing gives you the first hint that something has gone wrong. There is a noisy and unprofessional stir at the side of the stage, and an audible call of "pull harder!"
The comet jerks on the rail, moves a few inches farther, and then sticks fast, making hideous grinding noises in its track above the stage and showering the audience rather than the stage with sparks. The shower of sparks is raining down onto the corner of the awning, and as you watch, the awning suspended above the heads of the audience bursts merrily into flames.
Fire!