Things happen too suddenly for one to be prepared or react; with lightning speed.
这个消息来得真是疾雷不暇掩耳，我们都还没来得及消化，事情就已经发生了。
The news arrived with such suddenness that we had no time to digest it before the events unfolded.
Next Idiom
Things happen too suddenly for one to be prepared or react; with lightning speed.