Keep your eyes on the driver, William Greer. He turns his head back at around frame 285 and then back forward. Right after, near frame 305, keep your eyes on his left hand that crosses over his chest. He has what appears to be automatic pistol that he fires over his right shoulder. Watch how quick and efficient his movements are.
He then quickly turns back to the front pushing his body quite a bit forward and then speeds up the car that was almost to a complete stop. The mistake this guy made was not including the first turn by Greer in the slow motion clip.
https://youtube.com/watch?v=A8Siab5Zvyk