Well here is a theory.
ASX finally got tired of Hedge Funds driving the volatility index so they took CDU's lead and put all shares into suspenders..
Hey given today's early mark and Melbourne Cup day off I CDU apply for a bonus day or two.
Seriously what do all the on-shore desk jockeys do when the ASX is down - they wouldn't have the full background to work any other Bourse at a moments notice.