Taking a rinka hit stops the Metroid damage for a while and is less damage.

Requires:

{
  "enemyDamage": {
    "enemy": "Rinka",
    "type": "contact",
    "hits": 1
  }
}
{
  "metroidFrames": 256
}

Exit condition:

{
  "leaveNormally": {}
}

Unlocks doors:

{"types":["missiles"],"requires":[{"metroidFrames":50},{"ammo":{"type":"Missile","count":2}}]}
{"types":["super"],"requires":[{"ammo":{"type":"Super","count":1}}]}
{"types":["powerbomb"],"requires":[]}

Dev note: Avoiding Rinkas is more difficult than getting hit, so it is not important to know to want to get hit. Opening a door with a Power Bomb is energy neutral since you can place it early.