"Right now, warm counts for a hell of a lot." The fact that Jack was there? Was even better. Though he didn't voice this outloud. He sort of just assumed that Jack knew.
The fact that he was unarmed wasn't one that was lost on Ianto, especially after the things he's read in the journal. He would have given nearly anything to have his stungun back. Still, they had to make do. It's what they generally did. He wasn't planning on giving up here and letting people do what they liked to him.
"There's no way in hell you're going out in this mess, once we get inside and warm. I'm sure whatever you have will be just fine. I'll settle for almost anything." Almost. Some foreign things he wouldn't touch unless starving, after all.