It seems that the robot in question was possessing a Red Triangle, then proceeded to herd the White Circle into the red scoring zone which is a violation of G34:
Quote:
<G34> ROBOTS or HOSTBOTS may only POSSESS or HERD one GAME PIECE at a time.
Violation: PENALTY
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The Red Triangle was Clearly in possession as it stayed relative to the robot while turning and moving in reverse. Also, the White Circle is clearly being herded, or at least according to the definition of the rule, and it seems that the team was making a conscious effort to herd the white circle into the home zone (They hit the tube multiple times, even reorienting their robot slightly to ensure that the tube did not get pushed into the blue lane by mistake).
Looks like a pretty good call to me.