Why would he run home?, he thought he had lost Zimmerman who was following him from his truck?
He did not need to run home.
He stopped somewhere south of the T and out of view from the T. He had no concern about the weather when he was taking it easy coming back from 7/11 so he cold have just stopped anywhere on the North South leg to talk instead of going in out of the rain. To be out of sight, he would have had to be at least the same distance from the T as the West leg length of the T. That puts him over 2/3 the distance from the T to Brandy's location.
If he was concerned for his safety; he had the option to contact people, let RJ know.
He never demonstrated an concern/fear. He demonstrated anger.
If he thought Zimmerman was LEO; that could affect his perceptions and actions - get rid of anything he had on him that was illegal.
You have indications by Brandy/Tracy that he made it back. They will not tell you and will have destroyed any evidence; but their initial statements indicated such.
Tie that in with RJ statements and Martin was near the residence if he needed safety.