What is there to say really?
This would be as bad if it had happened between two members of staff in Starbucks, the local tax office, or indeed anywhere else. I doubt CRM training had anything to do with it unless this is a particularly endemic problem in Donghai Airlines? More likely a complete loss of self control, rationale and maturity on the part of one or more people. A rare event but I’m sure the appropriate remedies will be applied.