Every one of those folks saw the cartridges being loaded in the T-Rex rifle before they shot it! They were not blind-sided!

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The only shooter who knew what he was doing was the last one. He had the right stance to deal with that kind of recoil. Most of the others were standing like they were shooting a target rifle off hand, shoulders back, stomach thrust out, balance between the feet.

For that kind of rifle you need to take a trap shooter's stance, left foot forward, with most of the weight on it, shoulder held naturally, not thrust forward and anticipating the recoil, face firmly against the stock comb, butt firmly against the shoulder, just the way you would shoot a shotgun. Otherwise, it will bite you.

As far as proper stance goes, it does help to control the rifle, but that rifle is going to bite you no matter how you hold it!