This is the whole point that has turned this into a 30 page thread. You believe because he should have caught it cleanly that he was not defenseless due to taking 4-5 steps. According to the rule until he catches it he is still "Attempting to make a catch" and thus is a defenseless receiver. Defenseless receivers can not be hit in the head or "neck area" and Browner made his head snap back as if he had hit a brick wall. In the split second a ref has to look at that he is going to be like whoa something is fishy there. In real time it looked a lot worse then it really was.
This is just going in circles, at least AJ has pictures and the rules and asks questions you never respond to just "bad call case closed" when it really isn't. It was a awfully ticky tacky bull$hit call but by the letter of the law, the correct one.