The main idea of the video was to create a project with fire because it’s impressive and rare to see it in a Chain Reaction (as an example, there are much more tricks with air). And when there is fire it’s generally just a moving candle that burns a rope. But there is a problem with candles, you have to light it just before starting the reaction. It would be better to find a way for the reaction itself to light the fire just at the moment you need it.