Why and how does a 2 step launch controller shoot flames?

i was just wondering if anyone knows how a launch control 2 step works and why it shoots flames sometimes? Im just trying to learn some stuff so thats why im asking the question. any help is much appreciatedWhy and how does a 2 step launch controller shoot flames?
A two step is a low side rev limiter. You set it for your launch rpms that you want, trigger the devise with a button of some sort. While the button is held your RPMs will not go above the set amount.





So at the lights, you trigger 2 sep and floor the throttle.. The limiter keeps your rpms down by dropping one cyl at a time (not letting this then that cyl fire)





This causes the fuel in that cyl not to burn so it's just pushed out the exaust ports and goes into the hot headers, and cause headers/pipes are hot the fuel ignits and burns.





I have mine set at 3500 rpm and triggered with the brake light switch (one that turns brake lights on when you pess brake pedal)





So I stage the car, push brake pedal with left foot to hold car still and to turn 2 step on, then floor throttle with right foot.. RPM stays at 3500 and when I let my foot off the brake, car will launch at full wide open throttle and hit the tires harder