Run and spin jump from the platform in the room below, gaining horizontal speed but without bonking the door frame. Perform a momentum-conserving turn-around to make it around the corner of the ledge above. With limited runway for gaining horizontal speed, the timing of the jump and turn-around may be very precise.

Entrance condition:

{
  "comeInWithPlatformBelow": {
    "minHeight": 8.5,
    "maxHeight": 9,
    "maxLeftPosition": -1.5,
    "minRightPosition": 1.5
  },
  "comesThroughToilet": "yes"
}

Requires:

"canCrossRoomJumpIntoWater"
"HiJump"
"canMomentumConservingTurnaround"
"canInsaneJump"

Dev note: This applies to Warehouse Zeela Room and Tourian Hopper Room.