[Doug Frisk]

If you were right, the attacker could simply park a robot in front of the player station to prevent the defender robot from getting boulders. As long as they're parked a foot from the wall, the defending human player can still enter boulders onto the field so the attacker is not forcing a foul.

I'm sure it will be clarified in a Q&A but the defending robot always has a legitimate reason to be traversing the secret passage. The attacking robot is either there attempting to steal a boulder or blocking free access to the defender or both.

From a gameplay perspective it makes sense that the attacker must get out of the way of the defender.

I think the best you can expect to see is that if the defender initiates contact the attacking robot must immediately make way or suffer a foul. Otherwise attackers will be parking in there and watching for a 5 count by the ref.