The show said the fall was "practice" - I am not sure about the jack stand.... I would bet the guy in charge of maintenance/mechanics was tired and got upset when someone crawled under the truck with just the jack (HiLift?) I have seen several folks do it when fixing a truck in the woods, and I have even felt obligated to say something a couple of times... each time, the person was tired, it was near the end of the day and they were hurrying, I am pretty sure each also thanked me and figured a safer work environment. With the hours these guys were pushing in the show, I felt like that was what happened.... just my .02 cents.