Ianto's still feeling a bit shaken when the other man approaches him, and it takes him a moment to reassure himself that he really isn't under attack before he can respond.

"I, ehm. Yeah, that's right." He remembers him, from the forest. Venom, wasn't it? Something like that. An odd name, and the first person to mention to him the possibility that magic might be real. Well, little did he know. "I. Think I'm fine, I just." He glances around uncertainly. "I thought I saw something, I suppose."

It's more than that, of course, but how do you tell a person that you're experiencing hallucinations without sounding -- well. Mad.