Hermione's almost tempted to point out the fact that she's been caught in the path of crazed criminals before, that she's come out of it somehow whole and intact, though she's suffered torture at the hands of an enemy before, but she keeps her lips pressed shut. What she'll allow herself is the belief that she knows well how to operate in spite of fear. She's a quick thinker.

But perhaps she needs to better learn how to use her body instead of always thinking back to spells that are easily cast with an incantation and a wave of one's arm.

"Keep the hostage safe?" Hermione guesses with a slight shrug. She's pretty sure Kate would get that answer, anyway.