Tannerite is a legal target explosive. Nothing illegal going on here.
Tannerite is only legal if it is used legally. Detonations of Tannerite have been prosecuted in the past.
See http://www.wdio.com/kstpImages/childs_criminal_complaint.pdf
It would be no stretch for a BATFE Obamaton to consider this a “Wreckless Use of a Dangerous Weapon or Explosive Device” or “Explosive or Incendiary Device - Disregard of Human Life”, given that the US President had already declared that the public destruction of the Koran endangers US troops. They could even construe this as domestic terrorism.
Of course, they won’t prosecute unless the vid goes viral. If they did, the vid would go viral.