This would be exclusive of escort.
Basicly, the opposite. The ship would not come within a certain distance of another ship out there.
Simple enough. Ships with surround would attempt to have their fleet encircle the enemy forces. But with a special mod, this would result, if lucky enough to pull it off, in a targeting and damage bonus.
The ship would move very erraticly, when it does. Grouping this with always move would make for an extremely efficient group of hit and run forces.
The pertaining ship would shoot only a few shots before changing targets. Very useful for hit and run tactics.
This would also ruin rescuers, making them target the lone ship most of the time.