A door:
  OO
  OO
A new door:
  DD
  DD


FROM LEFT: Spawns door over right side of door, top of new door aligned with hero.

  OO	 OO
  >O	 >DD
		  DD

  OO	 OO
 >OO	 >DD
		  DD

 >OO	>ODD
  OO	 ODD

	Cannot access top-right cell from left.

FROM RIGHT: Exact mirror of left.

  OO	  OO
  O<	 DD<
		 DD

  OO	  OO
  OO<	 DDO<
		 DD
		  

  OO<	 DDO<
  OO	 DDO

	Cannot access top-left cell from right.

FROM TOP: New door spawns above hero, aligned with old door.

		DD
  		DD
  V		V
  OO	OO
  OO	OO

		DD
  		DD
   V	 V
  OO	OO
  OO	OO

	Cannot access bottom cells from top.


FROM BOTTOM: New door spawns above hero, aligned with old door.

  OO	DD  (Intended use)
  OO	DD
  ^		^
  
  OO	DD  (Intended use)
  OO	DD
   ^	 ^

		DD
  OO	DD
  ^O	^O

		DD
  OO	DD
  O^	O^



Summary:
	New doors can be spawned to the right/left, above, or diagonally downward.
	Should be faster to crawl around a map if you use the "From top" method to spawn doors above you when possible, rather than "from bottom".