gonna check it out not that it really matters what mods he used but my experiance with playing for fun with mods would help me lol....okay just watched he used a mod that warps him onto his bike when flung off (possibly steed) and then devconsole the G (gravity) and spin (I think its button is 3) cheat you can tell that because you goes up fast and slowly comes back down.
either that or his game is glitchy as hell