This is an amazing shot, but it is not quite what it appears at first light (sorry for the photographic pun). When you first look at the image, it appears to be taken at the moment that the fish was struck. However, the fish has already been impaled and is struggling to break free while the stomatopod is trying to pull it in. The first clue is that the propodus and dactyl joints are extended far beyond what they normally are during a strike. Also, the meral - carpal joints are twisted beyond what they would be during a strike. Finally, look at the blurring. The only place it occurs is at the last two segments of the raptorial appendage. The puffer is probably swimming up and toward you moving the terminal segments of the raptorial appendage while twisting the carpal articulations. The body of the fish is looked into capture position in the burrow to keep from being pulled out. That is why the eyes and and thorax aren't blurred. During most strikes, these would be lunging forward. Still, it is a great shot.
Roy