Knock the crab off the wall immediately and then quickly freeze it. Preparing and auto canceled Super before entering the room could make this easier.

Entrance condition:

"comeInNormally": {},
"comesThroughToilet": "any"

Requires:

"h_navigateUnderwater",
"canTrickyUseFrozenEnemies",
{"or": [
  {"resetRoom": {"nodes": [3]}},
  "canPrepareForNextRoom"
]},
{"or": [
  "canInsaneJump",
  "Spazer",
  "Wave",
  "Plasma",
  {"and": [
    "canDodgeWhileShooting",
    {"ammo": {"type": "Super", "count": 1}}
  ]},
  {"and": [
    "canDodgeWhileShooting",
    "HiJump"
  ]}
]},
{"ammo": {"type": "Super", "count": 1}}

Resets obstacles: A, B

Dev note: Kinda tough with no other beam/missile/super/movement.