Requires:

{
  "or": [
    {
      "and": [
        {
          "heatFrames": 150
        },
        {
          "lavaFrames": 40
        }
      ]
    },
    {
      "and": [
        "Gravity",
        {
          "heatFrames": 140
        },
        {
          "lavaFrames": 30
        }
      ]
    }
  ]
}

Dev note: This assumes that the Geruta closest to the item has already been killed.