Jump with either Springball or HiJump onto a Sciser while it is climbing the right-most mountain. Have Reserves set to manual and return them to auto after taking a deadly crab hit in order to gain two damage boosts. This gains barely enough height to reach the ledge above. If Morph is unavailable, then a down-grab must be done blind: buffer the down input through the reserve refill, then press forward immediately after taking damage.

Requires:

"h_navigateUnderwater"
"h_underwaterCrouchJump"
"canInsaneJump"
"canReserveDoubleDamageBoost"
{
  "or": [
    "h_underwaterMaxHeightSpringBallJump",
    "HiJump"
  ]
}
{
  "or": [
    "Morph",
    {
      "and": [
        "canOffScreenMovement",
        "h_trickyToCarryFlashSuit"
      ]
    }
  ]
}
{
  "autoReserveTrigger": {
    "minReserveEnergy": 85
  }
}
{
  "enemyDamage": {
    "enemy": "Sciser",
    "type": "contact",
    "hits": 1
  }
}