here's a different angle where you can clearly see martin's head snap back.
it's very frustrating for me to post here because so many of you don't follow mma and thus have no idea what you're talking about. that's a 205 lb ball of muscle flying through the air and extending his knee with all his might into the temple of a man whose momentum is driving right into the knee.
as for his arms being in the air let's just say the body does strange things when the brain is smashed into the skull.