Section 2.3 - Define the in-play movements of a Patroller

Every turn (this is the carry out patrolling rule):
    truncate the Arrival List to 0 entries;
    truncate the Departure List to 0 entries;
    repeat with Bod running through On Patrol Patrollers:
        if the Bod is ready to move:
            if a random chance of Drive of the Bod in 100 succeeds:
                carry out the Patrolling activity with the Bod;
    if Reporting is Collective:
        if the number of entries in the arrival list is not 0:
            report arrivals;
        if the number of entries in the departure list is not 0:
            report departures.