The changes happening in the Second Canyon were almost instantly known to the negotiation teams of the Federation and Empire.
It's no surprise that the Empire was aware of this news, because ninety Marquis Mechas from the Independent Regiment had already rushed into the entrance and exit of their Transition Gate base. Not to mention reaching this position, when the ninety Marquis Mechas appeared at the forefront, the Empire clearly saw them, but like the personnel at the front of the Second Battle Zone, they believed these ninety Marquis Mechas were only here for garrison duty and would make no moves due to the impending negotiations.