Right now, I think a good solution would be for Harine to control Kuhaku and Abel (henceforth called AK) for the moment. Abel can boost up Kuhaku to its torso, where he can scope out and begin probing at weak points in the machine's construction. This may or may not include bashing open the lockbox and retrieving the cards. Meanwhile, Abel can slice at its joints, mainly its 'knees' and 'ankles', to deal some damage and hinder its mobility. Once that's done, either AK can be forced to play defensively thanks to a new secret weapon on the mecha's part or just stand back. Then, GB can step in for their own tag-team, this time as a finisher, to rip apart the weaknesses that AK provided.