Don't scare the fish away.....please?

Time after time I see the same scenario:

Short tempered player opens for a raise--Fish calls x bets cold. Pot is HU after the flop, Fish catches ~4 outer. Short Tempered Player explodes in anger with a mountain of insults that I am sure you all have seen before. Fish stays for a couple more hands then leaves the table.

Now my question is, should I intervene? Is there anyway I can defuse this situation to make the fish stay and maybe silence the short tempered fellow? I could say the typical "nh" but I don't want to go as far as encourage the bad play.

How do you all handle this situation?