Quickly grapple to then release grapple on the grapple blocks a few times until they stop working. Be careful not to fall into the spikes.

Entrance condition:

{
  "comeInWithGMode": {
    "mode": "any",
    "morphed": false
  }
}

Requires:

"Morph"
"Grapple"
{
  "or": [
    "canCarefulJump",
    {
      "spikeHits": 1
    }
  ]
}
{
  "or": [
    "SpaceJump",
    {
      "and": [
        {
          "spikeHits": 1
        },
        {
          "or": [
            "canIframeSpikeJump",
            {
              "spikeHits": 1
            }
          ]
        }
      ]
    }
  ]
}