[And she had sworn to be more cautious with you in person, too. The only visceral reaction this time is the slight squaring of her shoulders, though; she keeps her silence through the explanation until she pipes up]
What is the fuel? [Her voice comes out impressively impassive, so that and the fact that Haruka can't see her face hopefully gives off that she's more collected than she actually is at present, in such a... position]