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I'm stuck at the part where you send Ben away to pick up flowers. The Walkthrough is no help, it says:

Now use the shortcut between the two main hallways;
this is the room/hallway with the small shaft in it. After you met someone
there, return to Ben Green's room.

To what shortcut it refers? I have tried opening,looking, anything with the places where there are shafts and I had no luck.
I beg of you. Help with this would be wonderful.