Entrance condition:

{
  "comeInWithGMode": {
    "mode": "any",
    "morphed": true
  }
}

Requires:

"canOffScreenMovement"
{
  "or": [
    "h_artificialMorphLongIBJ",
    "h_artificialMorphJumpIntoIBJ"
  ]
}

Dev note: After exiting G-mode, jump just above the vertical shaft in order to fix the camera.