Where is a funcitonal example of "preenc"?

[Phlagm]

Has anyone had success with using preenc in a condition, or do you know where it may have been used? I can get firstenc and encounter to launch the quest I'm trying to launch, but preenc does nothing. If I were able to make a race neutral at will, then firstenc would suffice, but that doesn't seem to be possible at the moment.

I basically am looking for a way to give a ship the opportunity to turn around before a fight with a race they've not yet met, yet remains hostile.