Three-color composite of H-band (blue), S(1) line emission (green), and K-band (red) UKIRT WFCAM images of the Serpens South MHO 3252 Y3 region, obtained in 2016 and 2017. Shock-excited features show up in green. MHO 3252 Y3 is the source of a large-scale well-developed bipolar outflow. Proper-motion vectors based on the 2011 Calar Alto data of Teixeira et al. (2012) and on 2016 UKIRT data are indicated.