Wait for the Alcoon to walk off and reach the bottom of the slope. Dodge it's fireballs with Morph or Screw, or simply freeze it and wait while standing behind it. Keep a half-tile gap between the Alcoon and the runway in order to extend the runway as much as possible.

Requires:

"h_canFrozenEnemyRunway"

Exit condition:

{
  "leaveWithRunway": {
    "length": 6,
    "openEnd": 0
  }
}