My question is ...
What is the basis for asking him if he has a CC or any other permit?
He used his weapon lawfully and is not under arrest or under suspicion of any crime.
So sure, the police or anyone curious can ASK him ... but is he required to answer?
What happens if he just replies “I’m not answer any questions” and not providing any documents except at the advice of my attorney if I am arrested”?
Then what? They arrest him? And on what charge?
Obviously the reporter wants the armed citizen prosecuted if he did not have a permit to carry the weapon. The citizen ruined a perfectly good mass hooting opportunity and another chance to advance "gun control" laws. So the citizen must be punished.
If they actually prosecute, he needs to ask for a jury trial. In Oklahoma, chances of conviction would be somewhere between zero and none.
The state that I hold my CC in requires you to show it to LEO if asked to present. I don’t think he could just say “I’ll not answer any questions”. But then again, if he retrieved his pistol from the car and it was legal to have that in his possession, then its a mute question.