I had an interesting phenomenon, just now. I used w2 to run north through a corridor, and it brought me to a room with quite a few monsters in it. Because of the positioning of the monsters, I continued running through them until I was in the *middle* of the room.

Like this:

The PC ran up to the entrance, and then dodged to the east and continued up until it was in the middle of the room, because the four monsters acted like walls.