Lure an Atomic or get a Covern to spawn to slightly extend the runway. Positioning a Covern is a bit tricky. Consecutive wall jump or Space Jump in place above the gap but not quite at the ceiling, or perform full height jumps to sometimes get the Covern to spawn in position. A crouch shot may help freeze the Coven when it is in position.

Requires:

"h_canFrozenEnemyRunway"
{
  "or": [
    "f_DefeatedPhantoon",
    "h_canTrickyFrozenEnemyRunway"
  ]
}

Exit condition:

{
  "leaveWithRunway": {
    "length": 14,
    "openEnd": 0,
    "steepUpTiles": 7
  }
}