Except that the code starts by reading "A. The Legislature hereby recognizes that the citizens of the State of Oklahoma have a right to expect absolute safety within their own homes." In the scenario proposed, one is not within their own home. I believe that is what makes it a gray area. It's part of the issue that came into play with Ersland.
But as others have mentioned, there's other factors at play here. I.e. did you know if the dwelling it occupied or not, what was your intent, etc. I simply will state it's far too complex an issue generalize about on an 2A forum and get anything close to a real-world applicable answer
The scenario posted he enters the house, then shoots.
