The blast hit the construct just as it turned wrong, and the explosion took its entire left leg off with a lurch, as the leg remained standing still and the rest of the construct toppled backward. It continued trying to move for a few moments, at least until Annella proceeded to dismantle it. That done, it proved to be well and truly dealt with. Incidentally, it looked as though the axe was separate from the construct itself, and of high quality.