Suddenly a huge fork of lightning hit the tree.

突然间一个叉状闪电击中了大树。

Black and purple clouds were swirling across it, and as another thunderclap sounded outside, a fork of lightning flashed across it.

黑色和紫色的云团在上面翻滚，随着外面又响起一阵雷声，一道叉状的闪电在天花板上划过。

Every head in the Great Hall swiveled toward the stranger, suddenly brightly illuminated by a fork of lightning that flashed across the ceiling.

礼堂里的人都转过头去望着陌生人，突然一道叉状的闪电划过天花板。