Burning enigma...

So...why does this happen?...

"As far as I can tell, the cotton ball in the video does not catch fire; a closer look at the footage suggests that the video was edited just before the blaze starts." ~ Theodore Gray 

http://www.popsci.com/node/64850/?cmpid=enews102512&spPodID=020&spMailingID=4863661&spUserID=MTc0NjIyMzMwOTAS1&spJobID=292660980&spReportId=MjkyNjYwOTgwS0