Blue Flame

So, what could cause a puff of blue flame in the building 7 fire?

This is from the NBC Restricted tapes. I don't know why they were restricted, or who restricted them.

At the top, at 0:27.

https://www.youtube.com/watch?v=1qOhuySFI7M

via International Skeptics Forum http://ift.tt/2222hK4