I suppose this could happen on a close to terrible supply with extremely high impedance, probably combined with overfusing. The short draws enough current to pull the voltage almost down to zero but doesn't blow any fuses because the short circuit current is never reached. If that shack is say on a long run of 6 mm2 aluminium the max. short circuit current could well be as low as 100 A and that's decidedly not enough to blow something like a 20 or 25 A fuse.
I'm not aware of any forum rules that'd keep you from linking to such a video.
