[The person Yuya runs into is a fair bit taller than he is, which is helpful, considering Ren's built like a stick and someone his own size walking into him might have knocked him over. He still lets out a bit of a huff, though it's hard to tell whether it's the breath getting knocked out of him or just being huffy about getting walked into. Or both.]

Hey, come on, there's nothing so scary here that you have to just run into people like that... [Honestly, it doesn't even click to Ren that someone could find the invisible servants scary, so he's pouting a bit at the kid as he straightens up again and wags a finger in a somehow not quite serious manner.] You're going to hurt yourself, you know.