Rename the “Street Actions” rule to “Street and Urchin Actions”, and add to that rule:-

Urchin Actions available to the Assassins are, with their effects:-

• Tail (specifying another Assassin as the Target): If the acting Assassin shares a Position with the Target, the Victim becomes Tailed by the acting Assassin’s Urchins (tracked secretly by that Assassin and the Referee).
• Report: The Referee privately informs the acting Assassin of the current Position of any Assassins currently Tailed by the acting Assassin’s Urchins.

Add a Street Action:-

• Double-Back (optionally specifying to Evade): the Referee privately informs the acting Assassin whose Urchins they are currently Tailed by, if any. If the acting Assassin specifies to Evade, then they cease being Tailed by other Assassins’ Urchins.

In “Notes”, replace “exactly one Street Action is known as a Note” with:-

exactly one Street Action and/or exactly one Urchin Action is known as a Note

And replace “Each Note is then processed according to that sequence: for each Note, the effects of the specified Street Action are applied to the Assassin who sent it.” with:-

Each Note is then processed according to that sequence: for each Note, the effects of the specified Urchin Action (if any) are applied, followed by the effects of the specified Street Action (if any).