But with the council back on the alert, it is not a good time for Stefan to fly off the handle.

但是委员会现在又起了疑心，Stefan这样失控可太不是时候了。

Calm down – there’s no need to fly off the handle.

【fly】冷静下来——没有必要发火。

And " to fly off the handle" means to react in a really angry way, so ideally, you shouldn't fly off the handle at all.

“to fly off the handle”是指以非常愤怒的方式做出反应，所以理想情况下，你根本不应该大发脾气。