"Time of flight" only the definition of flight was something like unpowered and untethered off the ground. So floating slowly to the ground becomes "flight" by the definition of the rules.
No, the burning of the paper removed a great of mass from the paper turning to to a brittle paper ash. After the fire was out is when the timer started, since the paper ash was so much lighter but the same volume its buoyancy in air was drastically increased causing it to "float."
The up draft from the flame wasn't utilized to power the flight, the fire was only used transform the original rolling paper into a "plane" by mass reduction through combustion.
His finger never touched the plane after it took "flight" just pointed to it from the side so that everyone could follow the "flight path."
Some classmates were upset, I was just impressed.
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