My take, he should have just left what he had at home, picked whomever up at the airport and gone back home, gotten the stuff and THEN gone shooting.
To me, something about this just seems hinky. I mean, most people know that in a post 9-11 time, bringing firearms onto airport property is a no no. So where has this guy been? On a remote island? I mean, I assume he can speak English, that's based on the article. If not, well, that might explain a thing or two?