Well, Shit. He didn't tell me not to tell anyone so here it goes...
(Sorry if I'm spoiling it, Josh...if you even read this stuff sometimes)
I hope I have all the details correct:
It was staged.
The two people "arguing" are Trent's and Josh's assistants. During the tour they started doing that to mess with people and goof around. First time Josh heard it he was walking past a closed door hearing the two of them screaming at each other. He went in to see what was up and they filled him in on what they were doing: Arguing for shits and grins just to see where it goes.
Josh wanted to get that on film and told them about it. So he set up his laptop in a "Blair Witch" shot facing the corner so it looks like the camera was left running and picked up the audio from a conversation you weren't supposed to hear. He started the recording and sat there waiting for them to start arguing -- and that's what the fake argument is about: Not knowing when Josh turned on the recorder and telling them to start arguing.
If you listen to the argument at the end of the video again, it starts "It's been going" and "How would I know it's going and he hasn't said a word about it". The rest just falls into place.
Aaron North is the guy at the end "breaking up" the argument/fight.
Josh mentioned he loved reading the comments on YouTube where people guess who was arguing and how most people thought it was Trent coming in to break it up.
So there it is...one huge joke.
