Theo's concern faded a little when the person stood, seemingly fine, and he took the offered hand and shook it after pretending that he hadn't flinched from the gesture at first. "Oh, I see." he said, feeling silly now but still pleased that the guy was okay.
He wasn't expecting the man to know his name and indeed it made him grip his wand and step back a little bit - he'd had nothing but bad experiences from people in the street who knew his surname and he was worried about what was coming as he nodded confirmation. The guy gave his name and a memory tugged at Theo's brain, seeing him around but not much more than that. "I'm Theodore." he corrected, hating hearing his surname out loud. "Yeah, I think I was. Sorry for interrupting." He added, indicating their little scene.