Spawn the Alcoon, then run back to the right so it will not stop and fire projectiles. Then wait for it to walk off the ledge.

Requires:

"canCameraManip"
"canTrickyUseFrozenEnemies"
{
  "heatFrames": 750
}
{
  "or": [
    "canDash",
    {
      "heatFrames": 40
    }
  ]
}