The first crab, coming down, is a bit tricky to freeze fast enough without any other beams or a missile. Prevent it from coming on screen until Samus is in position to hit it accurately. The global crab coming up can be used as a backup if the speed blocks are not broken.

Requires:

"canSuitlessMaridia"
"HiJump"
"canTrickyUseFrozenEnemies"
{
  "or": [
    "canDownGrab",
    {
      "obstaclesNotCleared": [
        "A"
      ]
    }
  ]
}

Dev note: Using these same items to get up from the lower portions before the global crab gets there should be reasonable.