Requires:

"Gravity"
{
  "or": [
    "HiJump",
    "canWalljump",
    "SpaceJump",
    "canIBJ",
    "canSpringBallJumpMidAir",
    "h_canCrouchJumpDownGrab",
    "canGravityJump"
  ]
}

Dev note: There is a frozen crab strat too, but it's generally a lot harder than the crouch jump and down grab.