Requires:

{
  "or": [
    "Gravity",
    {
      "and": [
        {
          "not": "f_DefeatedPhantoon"
        },
        "canRiskPermanentLossOfAccess"
      ]
    }
  ]
}

Exit condition:

{
  "leaveWithSidePlatform": {
    "height": 5,
    "runway": {
      "length": 5,
      "openEnd": 0,
      "steepDownTiles": 3
    },
    "obstruction": [
      5,
      5
    ]
  }
}

Dev note: Max extra run speed $1.7. This strat is included for completeness, though it apparently doesn't have any applications.