Gren unleashed his fury on the machine until he saw the girl escape. Once she was in the clear Gren tried to finish up burying the mech by unleashing a slavo of rockets. As they were flying towards the ceiling Gren turned to run when he saw a rock from his previous deconstruction hit the girl. He cursed himself for his recklessness and activated his Semblance to reduce his Friction, allowing him to slide towards the girl using the shockwave from his rockets to propel him forward. He outran the explosion and the shrapnel, positioning his body between the girl and the blast. He crouched low and made sure that his massive frame did all it could to prevent anything else from hitting her. He still had the God Eater out only to provide additional cover. 

The rumbling of the collapsed ceiling went on for only a short while longer, about five or so minutes by Gren's count. Eventually, the rumbling stopped. Where the robot once stood a large pile of stone and dirt replaced it. It nearly filled up all the way to the ceiling of the cave, but left enough room for someone like Gren to squeeze through. Once he was certain that there was no more danger from the debris, Gren looked at the girl. A human, with blue hair. She clutched her shoulder, likely injured and at worse broken. She would live, but only if they escaped so she could get medical attention. Gren bemoaned his lack of medical ability. [b]"Are you okay? Nevermind, that's stupid question. You just got hit by a rock. Can you stand?"[/b] Still wary of danger Gren stood up and had the God Eater at the ready, in case the noise had attracted Grimm or more robots. Offering his hand to help the girl up Gren spoke again. [b]"I am Gren Orchid. Heavy weapon specialist and boar faunas. I'm... I'm sorry for all of that. I should have waited for you to clear out. Truly, I apologize for endangering you like that...."[/b] Gren said solemnly.