Enter with a falling pose in order to be able to spark immediately on entry. This may require a quick drop through the sand in the room above.

Entrance condition:

"comeInShinecharged": {},
"comesThroughToilet": "any"

Requires:

{"shineChargeFrames": 10},
"h_navigateUnderwater",
"canShinechargeMovementComplex",
"canHorizontalMidairShinespark",
"canPrepareForNextRoom",
{"or": [
  {"and": [
    "Gravity",
    {"shinespark": {"frames": 34, "excessFrames": 6}}
  ]},
  {"shinespark": {"frames": 39, "excessFrames": 8}}
]}

Dev note: Frames are all assuming a toilet entry, frames could be reduced slightly if entering in a more favorable position. While the shinecharge frames could be smaller, this gives a small buffer to orient the direction Samus is facing in the room above. FIXME: It is possible to hero shot spark out the door.