Question 1: What faculty did Mordevolt belong to? Answer: 😎 Batwingus
2: What's Mordevolt's real name? Answer: A)
3: What is hidden in the safe? Answer: C) Music Box
Those are the answers that worked for me (when I moved the 'boulder' over the marks in front of those answers, the door opened to let me go to the next). I hope they work for you too ... and ...