Break the shot block before reaching the sand and then shinespark up. A diagonal ShineSpark will most likely not have any horizontal movement when performed from the sand.

Entrance condition:

{
  "comeInShinecharged": {
    "framesRequired": 160
  },
  "comesThroughToilet": "any"
}

Requires:

"h_canNavigateUnderwater"
"canPlayInSand"
"canHeroShot"
"canTrickyJump"
"canShinechargeMovementTricky"
{
  "shinespark": {
    "frames": 25,
    "excessFrames": 4
  }
}