Williams reacted angrily to being pushed from behind by Ross after his successful one-on-one strip was ruled as a penalty in the 58th minute at ANZ Stadium.
Williams stood to his feet to first throw the ball at the Sharks forward before taking a wild swing.
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Bulldogs full-back Cameron Phelps, who departs to join Wigan on Tuesday, produced a superb swansong with a hand in two tries for centre Tim Winitana while five-eighth Daniel Holdsworth was also instrumental in attack, setting up tries and scoring his own solo 50-metre effort before limping off with a corked quadricep in the second half.