Nobody at SWA is winging it. My guess is that two pilots got pulled outside by something that they thought was the runway. OKC is a bit of a dark airport and coming from that direction it isn't the easiest to see, especially RW 13. Clearly something went wrong, they should have never been in that position, but thankfully they were saved by the systems in place to prevent such a disaster. I suspect we will hear more about it in the weeks to come, but I doubt that any of us have the full picture or even half the picture of what actually occurred.
I am not defending what happened. It was clearly not good. I am just saying that this isn't the first time two well meaning conscientious pilots got suckered into making a bad choice late at night on the last leg of a long day. Hopefully it will be the last for a while.