— A worst-case scenario became reality Thursday when a large portion of the Yeager Airport hillside — which began experiencing some disturbing slippage over the weekend — collapsed into the valley along Keystone Drive, destroying at least one house, damaging a church, blocking a creek and forcing the evacuation of dozens of residents. Now officials are scrambling to mitigate damage as they wait on a man-made mountain to finish its bow to gravity. “It’s a bad situation,” said Kanawha County Commission President Kent Carper. “This is a very serious event.”