You had accidentally summoned Bill Cipher and ran into the woods to get away from him. Bill yelled, "GET BACK HERE, HUMAN! LETS MAKE A DEAL! HAND OVER THE BOOK! AND I'LL GIVE YOU WHATEVER YOU WANT..MONEY, FAME OR RICHES!" You yell no at him.

You denying his deal makes him angry, as you keep running you heard Bill yell loudly and then he shifts into his mad, glowing, red form, chasing you quicker now as you run through the forest.

(What do you you?)