Zzzap creating fireworks

There was a rumble of thunder, and a bright red flower of light filled the sky. A moment later a white blossom appeared next to it, followed by a blue one. Cheers rose and spread out across the Mount. Hundreds of children screamed with joy. The lights faded and four more bursts went off in a row. The sharp thunderclap of a distant cannon echoed in the sky.
…
Above the Mount, the night sky lit up with another burst of light. The applause echoed for blocks. St. George keyed his mic again. “How long do you think you can keep this up?”
“I can probably do another ten or twelve like this,” said Barry, “maybe a dozen quick ones as a grand finale. You can’t have fireworks without a finale.”

Excerpt From Ex-Patriots, pg 12-13
Peter Clines
https://books.apple.com/us/book/ex-patriots/id585738393