"When two class acts meet" ?

Unload both, have them rot in a jail for a couple of hours. Refuse entry to Japan for the foreseeable time.

Maybe it's time for the IATA to step up their game and have global ban lists and thus allowing courts (of law) to put passenger, that are convicted of fights and/or endangering passengers on an airplane, on the list for a couple of months/years.

Seems like a much better punishment than giving them fines and/or jail time.