Unfortunately this is not the play in question.
When I first looked at the picture, I actually though this should be an offensive foul given Wade's off arm shielding off the defender. However, on closer inspection Wallace's "grab of the gonads" certainly explains Wade's hand in the face of Wallace.
For most it is a natural reaction for one's arm to shoot out in a forceful manner, usually with a closed fist if they get a shot to the jewels!
