River stops when she she comes face to face with a pile of rubble. Looking up she lets out a string of curses thinking a moment she takes a few steps back before running into it with full force letting her head collide  against the rock hoping to loosen the rock.Some of the rocks came down, but it left River in such a daze that she tripped over a rock, fell out of a hole in the pile of rubble, and walked around seeing stars until she just passed out.