Big Ben got his arm hit while throwing this pass. When he felt that, he tried to pull the ball back, and then lost control. Classic Tuck Rule example. Also, most of the time, you are looking for the “open hand” to see if it was a fumble when the arm was hit. Amazingly, this was not overturned on review AND the Giants got away with a clip on the defensive touchdown that resulted.
[gif via @cfbsection]