I think they handled it pretty well for the mistake(s) that happen. I was surprised there wasn't an injury while they were manually firing the pod that was responding.
Broke several rules of pyro... way to close to the payload, when something doesn't respond you don't manually fire them. KNOW YOUR SHELLS, if you don't make your own buy from a reputable dealer. Cheap does not = pyro.
I only skimmed the video, but from what I saw, that was a very messy setup. I'll need to watch it in its entirety later.
How did they "manually" fire the shells? From the module, or by hand (torch, flare, etc)? If the latter, they did [technically] violate NFPA 1123
5.1.4 - "Where both manual and firing and electrical ignition are used during a display, mortars used for manual
firing must be separated at least 25ft. away from those used for electrical ignition."