The other boulder flew majestically through the air as only a boulder could. It clipped off the top of the highest carriage in the wreckage from the train still in the river, knocking the carriage over as it continued. It smacked into the side of the shield tunnel, bouncing up off it as the shield held long enough to totally alter its direction to upwards. It quickly succumbed to gravity though, and fell directly onto the bridge which half snapped, the weight of the boulder dragging it beneath the water.