Run from the ledge into the open doorway while hitting the frozen Atomic and the door transition simultaneously, just as the Atomic thaws and touches Samus during the transition. Note that this requires a precise freeze (2 pixel window), a small pixel starting window (approximately 3 pixel window), precise thaw timing, and a 50% success rate due to collision oscillation. The positioning of the Atomic is where its hitbox is one or two pixels away from the edge of the door frame, so that Samus can clip into the wall and stand as she touches the transition.

Requires:

"f_DefeatedPhantoon"
"canWallIceClip"
"canDownwardGModeSetup"
"Morph"

Exit condition:

{
  "leaveWithGModeSetup": {}
}

Unlocks doors:

{"types":["ammo"],"requires":[]}

Dev note: This can not work with a Covern, as it only moves vertically and can't hit Samus in the transition.