Rhynchomonas grazing on Caulobacter. Not only the cell body but also the stalk is ingested by phagocytosis. Finally the flagellate moves to the position of the holdfast and seems to dissolve it. Otherwise it would get stuck to the ground. (Real time of this scene about 3 sec)

What we can learn: First, nature's strongest glue can't resist against a flagellate longer than 3 sec. Second, being elevated above others will make you attackable. Even this known issue was already demonstrated by the microbes!