I'm a little confused by your depiction of Oskar, he wasn't running. He'd been crouched at the bottom of the stairwell in another room, just off the main-room where he screamed after coming down the stairs and finding his father who, presumably was heading up to get him when the creatures came. Vasily is now steering him into the common room. It is great to see the interaction though and the subtle nuance of the disrespect felt was a wonderful touch.