Why the look of consternation?

His rubicund face expressed consternation and fatigue he appeared to be in a spasmodic sort of hurry.

Whenever they come upon any news bearing upon either security or causing consternation they go about spreading it, whereas if they were to convey it to either the Messenger or to those from among them who are entrusted with authority, it would come to the knowledge of those who are competent to investigate it. But for Allah's bounty and mercy upon you, (weak as you were) all but a few of you would surely have followed Satan.