Gee I don't know, how could electricity visibly spark from an "repaired" wire when it's moved and he wasn't wearing the PJs. Honestly if he was that mad about the incident and his wife getting hurt maybe he should of reported the electricians tape, the extension cord, the treadmill, and the space heater in their own reports as well. (I checked he didn't.)
Maybe he didn't realise that a metalic thread can actually be made of, gasp, metal and conduct electricity. Watching the video he provided (BTW love that silky smooth voice) I think he's confusing the blue electric arcing of the current with an actual flame. If he toasted some marshmellows while demostrating or if there had been smoke coming off the wood chair he used I might believe the PJs caused electricity to turn into a real flame and not just the current jumping from thread to thread.
ON a more serious note, how could he and his wife not know not to wear anything that contains metal while using electrical exercise equipment. I've never owned my own gym equipment, but I have had gym membership to place that used electrical based equipment as well as over a year of physical therapy that used tread mills and spinner bikes that ran on eletrical power. Guess what the gym had warnings al over that clothing with metal and metal like properties can pose an electric shock potential especially if combined with sweat or water. The physical therapist even handed out to every new patient a list of does and don'ts, and the top on don't side was "No clothing with metal buttons, rivets, threads, or sparkling iron-ons." His reasoning was that almost all of his patients would be using TENs therapy which passes a low level eletrical current through the affect muscle to cause twitching and clothing with metal may attract to electrical current to place that it wasn't needed and heat the metal.
