I went through the tight passage on one of the Y cards, both characters were on that tile. I didn't want the dream to end so I suffered the wounds and sealed the cards. I discard all the tiles without dreamers on it (so the remaining X, Y and Z tiles). All that remains is the Y card I'm standing on.
Now I can't perform exploration because it's impossible to be far enough to explore? I have nowhere to go other than to leave the dream anyway, is that right?