Ianto lets out a scoffing noise that's not all that far away from a snort because honestly it's more than that and he knows that but if that's how John wants to play things then fine. He can play too, he supposes.

"I made a mistake," he replies, exasperatedly. "And he didn't give it to me to get me in trouble. He gave it to me to get me out of it. There's a spell or something on it. I don't know. I think it only works the one time, but it's a fail safe. In case I run into trouble. It's why he told me to wear it if I'm in danger, it's supposed to protect me. It could have spared me a literal headache back at the carriage if I had only remembered I had the damn thing in the first but I suppose if we're going up against these people again or worse, a dragon as well, it's better I saved it for the real fire fight I suppose."