Just wondering which section of the CRM manual recommends settling disagreements using your fists? Maybe they fell out over how much Fuel they were going to upload before departure? Still as we all know these things will happen. I was on the Jumpseat one day on Finals working for a certain operator based in Rotterdam when the F/O was doing the landing in an A300,cut a long story short, he f***ed it up but got the A/C on the ground ok, during Taxi in to stand the Capt turned round and punched the F/O hard in the shoulder,said nothing and continued with the after landing checklist. Not another word spoken for the rest of the journey to the hotel!