Upper panels: HH 250 region imaged with an Hα filter at two different epochs 22 years apart. The 1994 images were obtained with the NTT/EMMI, and the 2016 ones with the NOT/ALFOSC. The field is 4.′0×4.′5 across. The reflection nebula seen to the NNW of the embedded source has disappeared in the intervening time, whereas nebulosity just E of the source has brightened in the most recent image. The red triangle marks the position of the embedded source HH 250-IRS. Lower panels: close-up view of the bow shock reveals a dramatic brightening of the Hα emission between both epochs, as well as other changes in its structure. The field is 41^″ × 41^″ across. The grayscale of the lower panels has been stretched with respect to the upper ones to better show structure in the bow shock.