A charge beam shot will pass right through the dividing wall if fired diagonally from the correct 2-pixel window. Using angle up, it is where Samus' front foot is on the seam in the floor.

Requires:

{
  "notable": "Back-Side Magic Pixel Beam Fight"
}
"h_navigateUnderwater"
"Charge"
"Plasma"
{
  "or": [
    "canXRayWaitForIFrames",
    "canTrickyDodgeEnemies",
    "Gravity",
    {
      "enemyDamage": {
        "enemy": "Botwoon 1",
        "type": "acid",
        "hits": 1
      }
    }
  ]
}

Clears obstacles: f_DefeatedBotwoon

Sets flags: f_DefeatedBotwoon