I agree.

But I go a little further.

I say that they will also exhibit a physical strength with which it would be otherwise impossible to credit them.

Fear lends it to them." "Yes," Thresk interrupted quickly, "but don't you see, Mr.Pettifer, that you are implying the existence of an emotion in Mrs.Ballantyne which the facts prove her to have been without--fear, panic?
She was found quietly asleep in her bed by the ayah when she came to call her in the morning.
There's no doubt of that.

The ayah was never for a moment shaken upon that point.