Requires:

"Grapple"
{
  "heatFrames": 420
}
{
  "noFlashSuit": {}
}
{
  "or": [
    "canDash",
    {
      "heatFrames": 30
    }
  ]
}

Dev note: With a flash suit, swinging across with Grapple would require morphing/unmorphing; but if Morph is available, it's faster to just go through the morph tunnel.