After Mann got into the cafe, he went to the bathroom. After he came out, he sat down and gaped through the front window of the cafe.
Mann saw that the truck and trailer were parked outside of the cafe. He did not get a good look at anyone when he first entered the cafe. It could be anyone. Mann decides to leave and get back on the highway.
In the end, Mann kept fighting and fighting with the truck after the cafe. The truck pulled over on the side of the highway just to wait for Mann to catch up with him. Mann sped faster, the truck kept swerving, and then it vanished from Mann's rear window. The truck went up in flames as Mann stumbled to the trail edge, staring downward at the truck