First off it is a single shot, what you are seeing is called editing.
What is this "editing" thing you speak of? I've never heard of it.
Seriously, though, why are you talking down to me? Are we not allowed to disagree? I just stated the obvious. Perhaps you have inside knowledge on this movie, and I'm not at all doubting you when you say it's one shot. But from watching that clip, there's absolutely no way to discertain as much, because, as we both know, it's been edited.
Also, your explanation of why it's allegedly cheaper to shoot one long take does not really jive with reality. If it were cheaper to shoot in this manner, then all directors would do that, on all movies. But they don't. I think it's common knowledge that the longer (and more complicated) a shot gets, the more difficult it becomes, exponentially, to properly execute it.
If a six-second shot takes x amount of time to rehearse, then a sixty-second shot should take 10x amount of time, right? Nope; that's faulty logic. It takes WAY longer to rehearse.
Furthermore, shooting it takes longer. If you're only shooting a 2-second shot, you only need to get 2 seconds correct. With a really long, complicated shot, you dramatically increase the odds that someone will make a mistake. You got the entire shot perfect, except for that one breif moment, the boom creaped in to the shot, or the bad guy reacted just slightly too late to the punch, or the good guy made an unintentionally funny face when he pulled the trigger, etc.
And what's this you say about having to break everything down, and set everything up for each new 2-second clip? What?! No director in his right mind would even think about doing a new setup for every punch in a fight scene. Saving time on setups is filmmaking 101, so if you can light an entire scene at once, common sense dictates your actions.
In the end, I think we can just look at what the vast majority of directors do, on almost all movies. It's been well-established that breaking a scene down into many shorter shots is faster, more efficient, less expensive.
So why on Earth would you go to all the trouble to get one really long shot, then edit it down to the point that it becomes unrecognizable as such? The only reason you would do that is if you intended it to be one long shot, and shot it that way, but then in editing, it just didn't look the way you had envisioned it, so you cut it down. And then you smack yourself on the forehead for wasting so much time on such a complicated shot that you didn't even use.