The way it looked to me was HJH (Harry Johnson-Holmes) collared the ball carrier, then as the maul moved forward both went down, as the force of the 16 bodies moving forward made it impossible for either man to hold his feet. Is that a penalty? I have to say I honestly don't know.
As to the repeated scrum infringements that followed, Slipper, probably our most capped LHP ever, certainly dominated a very young THP probably playing his 20th minute of professional rugby, however another ref could just as easily have penalised Slipper for deliberately going around the corner.
Before anyone jumps into me over this, I am not suggesting Berry won the game for the Brumbies, the reality is the Tahs, in their creativity, despite effort and effectiveness, are able to consistently find ways to lose a game of rugby!