Here's why:
* Contractions: "Just going" and "that old house of his" are contractions, commonly used in informal speech and writing.
* Slang: "Full tilt" is an informal phrase meaning "at full speed."
* Sentence Structure: The sentence lacks punctuation and is grammatically incomplete, which is typical of informal communication.
Overall, the passage uses casual language and phrasing, making it sound like an informal conversation rather than a formal document.