But Hagrid was rethinking his life. His expulsion was caused by Headmaster Dippet, but the real culprit was Tom Riddle, when he is thinking back. Hagrid didn’t know, but somehow the boy was familiar. He knew that Riddle disappeared after everyone graduated and was never seen again. The half giant also questioned, why Headmaster Dumbledore didn’t help him back then, in order to lift his expulsion, when he became headmaster. He was also the head of Gryffindor and the deputy-headmaster and he would have been able to stop his expulsion, but through the last months, Hagrid realized that he was used, in order to build for the headmaster, the image of a kind grandfather. But now without him, the image was gone. Hagrid was unhappy with this realisation, but thankfully, he was now able to continue his education and finish it.