Clarify scoring if message budget exceeded.

challenges/shared_autonomy_challenge.tex

@@ -80,7 +80,7 @@ \subsection{Miscellaneous Notes}
 \item Similarly, no specification is given on what control interface can be presented to the human operator. Teams may choose to directly command walk directions and kicks or to use a mixed autonomy mode where the operator gives high level directives that the human-operated robot implements. The only limitation is that the input from the operator must be some sort of command, i.e., it is not sufficient to only augment the robot's perception or localization.
 \item Finally, the hardware of the interface (e.g., keyboard, joystick, virtual reality headset) is left up to the discretion of teams.
 \item The defending team is not permitted to score because doing so may be too easy to counterattack with long kicks due to the field size and the limited size of teams. As a corollary, the attacking team cannot score own goals.
-\item If the attacking team exceeds its message budget, it may not score points with either goals or passing.
+\item If the attacking team exceeds its message budget, then its score is set to zero and the best result it can obtain is a draw as in the main competition.
 \item Total expected time per match: 5 minutes (3 minutes playing and 2 minutes set up). 
 \end{itemize}