[EricH]

Originally Posted by the programmer

My interpretation is that if their bumpers are not crossing the plane of the outer works, you can do as much patrolling as you want. However, as soon as their bumpers cross the plane of these outer works, if a referee thinks you are "interfering" with a team crossing the outer works, it's a foul.

This interpretation. And bear in mind that it's BOTH ways, in or out.