The answer to your first question is a giant maybe. The rule governing it is <R25>. It is legal to block or push on the tetra in your possesion, but it is illegal to grab the tetra and pull you over. For my interpretation: If it is sitting on the robot loose, there wouldn’t be a penalty for grabbing it off. If it is attached to your arm and they pull on it and the arm releases nicely, no penalty. If they pull your arm off will pulling on the tetra, then there would be a penalty.
<G18> governs descoring tetras, both when CONTAINED and when STACKED.
<G18> ROBOTS can remove or displace TETRAS CONTAINED in a goal but cannot remove TETRAS STACKED on a goal… is that what you ment, becuase you can take out tetras from under the goal just not the ones that are on top or “caped” if you could not take out a tetra teams would not be able to take away or re take control of a goal with out putting in more of there own tetras.
or even gave the big ball into some ball receiving chute thingys
well so if that plan worked. hmmm if you can ‘accidentally’ crown 40lbs of tetras over a robots arm, that would be rendered useless. well nvm im going to bed now