Taking a rinka hit stops the Metroid damage for a while and is less damage. Note that angle-down shots with a Metroid on Samus are unreliable, so it is recommended to jump and shoot down to open the door.

Requires:

{
  "metroidFrames": 240
}

Exit condition:

{
  "leaveNormally": {}
}

Unlocks doors:

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

Dev note: Power Bombs negate some of the damage taken while waiting for the door to unlock.