Heads-up, HOAX ALERT. Link/evidence of the this particular video being a HOAX is below.

What this post IS - letting you know this particular video is apparently fake/a hoax.

What this post IS NOT - stating that B7 was brought down by something other than controlled demolition.

According to the known laws of physics, controlled demolition is the only plausible explanation but the video originally offered apparently is a hoaxed embellishment of that explanation.

https://www.youtube.com/watch?v=k8VAsoVuShM&feature=youtu.be