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[–] Aaronkin 0 points 1 point (+1|-0) ago 

It was a concert so I would assume lots of fireworks. You find a back pack unattended and don't risk any ones life to look inside, so you blow it in place for safety. If you handle fireworks or are around fireworks your cloths will trigger an explosive scent dog. Another reason to blow in place. Really. That is what do and why they do it.