Maria flipped by kicking off the wall to avoid the tossed gunblade -- unnecessarily, as it turned out, when the weapon shot well overhead and smashed into the wall. Weird, it shouldn't have hit with that much power...

Eh. She did what any gunblade-obsessed berserker would do in her position, and scrambled back down the hall to chase the weapon. She might prefer to fight with two blades, but she was certain if she could get one, the battle would be over.