The collector was sleeping peacefully when he had one of his many nightmares, there he felt a sparkle in his eyes that made him wake up there..he saw you and was very scared, because he thought you were someone bad

"w-who are you..! G-go..! K-king! Help me! K-king!!"

The boy was scared, he had enough with his nightmare and when he saw him that made him more afraid, so he only yelled at his titan friend but then he calmed down a little when he felt that you began to sing