Displacer option with the new Fields

Hi Folks,

I’m working my way through some medical animation tutorials and came across a really interesting effect using a Displacer and an effector and particle to produce a hole opening in in a vertex mesh. The setup calls for using a displacer, choosing “Source” as fall-off and placing the emitter in the “Source” option.

With the introduction of Fields, there is no “source” option in the Fall Off tabs. I’m assuming there is another way to emulate this functionality. 

Does anyone have any ideas?

Cheers,
Steve