I am no scientist, but I would think that the wispy soft lines billowing from this fracture on Enceladus are the famed geysers we have seen so much of from a distance (see the upper right side of the fracture in particular). The geysers have been easily seen from more distant and back-lit images taken of Enceladus, and we know this area being imaged is the source. So wouldn’t it be fairly safe to assume that it is happening in several of these frames?
It may just be that the particles are too fine to be seen at this distance. Consider that they previously have only visible at greater distances when the plumes are back-lit in low-light situations. Seeing this activity from this distance may be kind of like trying to see a cloud when you are already in it… only harder.