Difference between Discussion and Argument

In my professional career I have seen many times a good healthy discussion getting converted into a fierce Argument. And the sad part is people in room don’t realize that. I have learned a very simple definition of each to distinguish the two

Discussion – > What IS Right?

Argument - ->Who IS Right?

So what I do if I am part of an argument  or seeing it coming?

As soon as I get the sense that person is not interested in Discussion but rather in proving himself Right  –  I will leave the room or spot with a smile and request him to circle back on the topic some time later.  What I just did is gave other person some time to cool off and release himself from his ego so he/she can think thoroughly.

And below is an interesting video describing why one should not Argue