Somehow, a gust of wind must have found a smoldering ember in a tree pile in a pit at Hugh Butler Lake mid-afternoon Sunday and the spreading fire burned several acres of grass and trees. Except for some of those really weedy red cedar trees. The other challenge was the mud and underlying frost. Just envision a 67,000-pound water truck sliding down the hill sideways. Aric Riggins, the Nebraska Game and Parks superintendent at the lake, said this morning that he cut down some trees two weeks ago and burned them in a pit. “I’ve checked it every morning, put water on it, no more smoke, it’s out,” Riggins said. He thinks that a gust of wind must have rekindled some embers, and the fire jumped out of the pit and spread through grass and trees just south of the marina.