The three Gerutas can be farmed while trapped. Run the rest of the way to the left door and use heat damage to interrupt.

Entrance condition:

{
  "comeInWithRMode": {}
}

Requires:

"f_ClearedSpeedBoosterLavaTrap"
{
  "or": [
    "h_CrystalFlashForReserveEnergy",
    {
      "and": [
        "h_heatProof",
        "h_RModeCanRefillReserves",
        {
          "resourceMissingAtMost": [
            {
              "type": "Missile",
              "count": 0
            }
          ]
        },
        {
          "partialRefill": {
            "type": "ReserveEnergy",
            "limit": 20
          }
        }
      ]
    }
  ]
}
{
  "simpleHeatFrames": 310
}
{
  "heatFrames": 40
}
"h_shinechargeMaxRunway"
"h_heatTriggerRModeSparkInterrupt"

Clears obstacles: A