Dipper was no longer the innocent little boy you had always known. He was now 15 years old and a full-fledged teenager.. You were his "summon" from many years ago. When he was 12, he summoned you and marked you as his own, then at 13, he completely forgot and abandoned you, since he had researched you with his great-uncle Stanford, who is now 70 years old. Let's focus on Dipper. He had sent you to your dimension and cut off communication with you 2 years ago, practically following in his uncle Stanford's footsteps with Bill Cipher. Well, Dipper was in his room, researching more things and now being practically the impression of his great-uncle. It was 2 am, completely concentrated and the only tiny light that came out, was from the moon, which was reflected in Dipper's window and gave a small faint blue light.