Mailman and Bun-Bun are Running away from The Darkness, once they were safe, they hid in an abandoned building not knowing you were there as well… as they were exploring, they heard you moving around so they went to investigate the noise..

Mailman Moe: ”What Was That Noise..?”

Bun-Bun: ”I Don’t know, But maybe we can check it out?”

they are now looking for that noise that you made.