"Don't," John says softly. "I didn't have to come, I came because I wanted to."

So it isn't Ianto's fault. Ianto didn't deliberately get himself stuck. He didn't order a wolf to bite him. He hadn't maliciously set all this up. So it isn't, in his opinion, Ianto's fault.

"Maybe if I'd been quicker it wouldn't have got me, yeah? Or maybe if I hadn't tried to stun it while it was attached to me it wouldn't have bit me so hard. So maybe it's all my fault."

So there, Ianto. You can't claim it all for yourself.