I see nothing which could be interpreted as a violation of law by anyone, though perhaps an argument could be made that the videographer could be charged for tying up first responder resources at an active shooter crime scene for his amusement.
Filming first responders is fine; realizing your filming is being mistaken for criminal activity which is actively diverting attention from an active shooter crime scene , calling your buddy about it, and continuing said activity "for kicks" is not fine.
Filming first responders is fine; realizing your filming is being mistaken for criminal activity which is actively diverting attention from an active shooter crime scene , calling your buddy about it, and continuing said activity "for kicks" is not fine.