It makes sense, now that Kurama's said it, but... Hiei can't help the sigh that leaves him. They are both tired, he's sure, so he has no place to complain about how weary he is. At least he can catch a nap here or there, and while Kurama has control he thinks he ought to be doing so as soon as possible.

After a moment the fire demon rolls his shoulders, mentally and physically realigning himself.

"Then we continue as we have been." He hasn't left Kurama to his own devices before now, and he certainly will not be when they are on the cusp of a possible solution.

"How long do you think you have? Do I have long enough to take a cat nap?"