Group the Metroids by hitting the first Rinka with a Power Bomb. Then Kill all three Metroids with Power Bombs while avoiding damage.

Requires:

{
  "enemyKill": {
    "enemies": [
      [
        "Metroid",
        "Metroid",
        "Metroid"
      ]
    ],
    "explicitWeapons": [
      "PowerBomb"
    ]
  }
}
"canMetroidAvoid"
{
  "or": [
    {
      "ammo": {
        "type": "PowerBomb",
        "count": 1
      }
    },
    "canInsaneJump",
    {
      "metroidFrames": 100
    }
  ]
}

Clears obstacles: f_KilledMetroidRoom3

Sets flags: f_KilledMetroidRoom3