Move to the middle section after the first Metroid has died to kill the remaining two.

Requires:

{
  "enemyKill": {
    "enemies": [
      [
        "Metroid",
        "Metroid"
      ],
      [
        "Metroid"
      ]
    ],
    "explicitWeapons": [
      "PowerBomb"
    ]
  }
}
{
  "metroidFrames": 280
}
{
  "or": [
    "canDodgeWhileShooting",
    {
      "metroidFrames": 100
    }
  ]
}

Clears obstacles: f_KilledMetroidRoom4