I was on this flight (and just arrived in Shanghai) and I had a different understanding of events. It was not that two pax were duke-ing it out (as I was talking to the purser) but it seems an older gent had fallen into a diabetic coma and was violent and combative towards his wife so the flight crew restrained him in an effort to treat him. there were a number of medical personnel on board (I heard one comment that "there are more doctors on this plane then passengers) and the guy in front of me in BE actually stepped in for a bit. I think the way that the OP stated it may lead some to think that two pax were brawling it out and I'm not sure that's an accurate portrayal but it is true that the guys did become combative. I agree, the flight crew and DL and the Hilton all handled this incident w/ aplomb and professionalism. As we queued up this a.m to re-board the flight, there was talk that that offending pax was going to be onboard but the flight crew told me he had been "accommodated on another airline."

this whole incident must've cost DL a pretty penny: we dumped fuel before landing in ANC, hotel rooms for all the pax, cancelled flight from this aircraft not arriving in time in PVG, dinner and then breakfast in ANC for everyone. Wow.