Na was a dick about the whole thing. There was at least15 seconds after DJ's put came to rest 6 in from the hole where Na SHOULD have said good. Not giving DJ that putt was a pure dick move and calling him out on camera when he gave him a half anyway was just to shake DJ up, which it did. I hope Na doesn't make the Ryder Cup as an alternate because of this. Bush league crap like that shouldn't come from "professionals". 
I don't think Na handled the situation as well as he could have. However, he should never have been put in that situation. DJ broke the rule and you blame the guy who points it out? That's a harsh take.
I wonder what Hogan would have done. I expect he would have stood there in silence waiting for DJ (after finishing his childish behaviour) to either concede or call the penalty on himself and carry on.
Ciao