Aside from the fact that the incident was mentioned in another thread, that I'm too lazy to look up, there is an opportunity here to discuss the role of the CHL/CCW holder in civil society.
My first CHL instructor made it very clear that we were getting a license to carry a concealed weapon, not a "Batman" card or a "Junior G-Man" card. His point was that the license conferred no police power of any kind, nor any responsibility to see to public safety over and above the responsibility of one citizen to another, regardless of a concealed handgun license.
In the cited case the CHL holder was able to terminate an assault without having to discharge his weapon. I think the discussion could concern whether or not his intervention was wise.
My own view is that I can have no informed opinion since there is no substantive information to be had regarding what the fight was about, what it looked like to him, whether he knew (as much as one can claim to know such a thing a priori) that showing the pistol would defuse the situation rather than escalate.
I might have yelled at them to cut it out as I called the cops, but seriously doubt I would have drawn my pistol. Seriously, seriously doubt.