So, according to the affidavit, she became nasty with him because of traffic, he dropped her off, then he found out the traffic would clear up, and went back to tell her they could still go. That's when she hit him with the shoe.
Then he drove around for an additional 3 hours, came back bearing gifts, and that's when she went Jack Torrance and he texted 911. But once they get there he's telling them about the shoe and leaving out the machete until he's interviewed again later? I hate to agree with Bubby, but something doesn't seem right.