Kaiba gives a faint nod in affirmative. Yes, he's certain that the poison is out, as long as it's of the sort he thinks it is. At least any traces will cease to affect him as soon as what has wears off.

I can still hear things. They're not voices, though.

Sounds. Taps and shuffles. His pupils are still slightly enlarged, but nothing like what they were.

They have to feed us. Unless they want us to die.

Which they might. Dying was not permanent, after all.