Greggory considered his options, thinking about all he had experienced.  "Alright, if you were a good-spirited entity, you wouldn't be trying to scare or force me into opening the door, so that's not going to happen.  You may be able to trick my eyes, and get me to turn around, but I can still feel the floor beneath me, and I felt the door I ran into, so your illusions aren't perfect."  Greggory placed his hand on the wall next to the door and, using that to keep him moving straight, tried to get away from this presence.