Looked to me like the guy in the deuce knew full well what he was doing, evidenced by him flipping off the truck driver as they accelerated away. I've never driven a big rig, but I have utmost respect for their need for space and consideration, given the mass of the vehicle and the inertia involved, and that includes being aware if they're closing on a slower vehicle, setting up a passing opportunity only to have some moron pull out to pass them at the last moment.