I read an online guide that suggested the following (will try to keep it short)
1: Use the gargoyle (lower) to access the bed room, pick up three tokens (orange, red, green).
2: Use the gargoyle (upper) to access the sparring room.
3: Put the three tokens in the sparring dummies from left to right: orange --->red--->green.
4: attack the sparring dummy in the middle until you get a message saying: a door has opened somewhere nearby.
The problem is that the door that according to my guide was supposed to open (the door between the stairs and the bedroom) won't budge. Any suggestions?
Ps. I found the guide after some trial and error, so I used the gargoyles in differing order until I tried it the "right" way.