Like blackhornet said, we need to know how you make spr1 and spr2 move to answer you. If it a bullet behavior ? A platform behavior ?
Basicaly you would want to set the X and Y vector of the movement depending on the sign of (spr2.X-spr1.X) and (spr2.Y-spr1.Y) but it could also be easier with the angle of motion.... all depends on the tools you are using.
if you don't know how to explain this, try to share your file so we can take a look.