Requires:

{
  "enemyDamage": {
    "enemy": "Sidehopper",
    "type": "contact",
    "hits": 1
  }
}
{
  "enemyKill": {
    "enemies": [
      [
        "Sidehopper",
        "Sidehopper",
        "Sidehopper"
      ]
    ],
    "explicitWeapons": [
      "Missile"
    ]
  }
}

Clears obstacles: A