I have yet to see a statement made at the scene result in a defendant's acquittal.
Yet it will often result in the shooter not being charged.
Sorry, some common sense must be used here and many defensive shootings never progress to an arrest because all the pieces fell into place at the scene.
Don't get elaborate. Don't hypothesize. State only what they see and stick to having feared for your life and having acted to stop the threat. Beyond that is lawyer time. Saying nothing will GUARANTEE being guilty in the LEO's eyes first.