Wait for the first Holtz to attack then either use the Magdollite for IFrames, or avoid the projectiles and continue dodging bats.

Requires:

"h_canNavigateHeatRooms"
{
  "or": [
    "canTrickyJump",
    {
      "and": [
        "canHorizontalDamageBoost",
        "canCarefulJump",
        {
          "enemyDamage": {
            "enemy": "Magdollite",
            "type": "flame",
            "hits": 1
          }
        }
      ]
    }
  ]
}
{
  "heatFrames": 330
}