Hey Galgarion, I have an idea for what would make us useful for round two.

Since the mech is still facing the opposite direction if Bridget and Gren, and has suffered some damage, perhaps we could use this chance to spit the box containing the artifacts on its back. Not wanting to risk their destruction. While fighting the machine, Bridget could use her chain blade to latch onto the container. Than Gren could grab that chain and use his Semblance to increase the Friction of the blade to the box (so it doesn't slip) and loosen the tension between the box to the mech (so it would be easier to pull out). Than Gren can just use his Orcish strength to yank the chain and the box off the Mecha back, allowing for us to safely wreck its shit.