This has little effect on my ships, as they know Rico's coordinates, and are already in route. Drayson's ships don't know the exact coordinates, but since they jumped along the same exit vector as my vessels, it is likely that they will be caught by the Interdiction Field, if they followed my ships with an form of accuracy.
It would be possible for them to miss the field, but only if they made major miscalculations in following my ships.