Jump through the transition with blue speed. Perform a very short speedball to kill the bottom crab and get into position below the hole. Perform a gravity jump and use Spring Ball to bounce through the top of the hole. Use a pause buffer to remorph, also taking the opportunity to equip Gravity again. Then chain temporary blue into the next room.

Entrance condition:

{
  "comeInGettingBlueSpeed": {
    "length": 0,
    "openEnd": 1,
    "maxExtraRunSpeed": "$1.A"
  }
}

Requires:

"canSpeedball"
"canGravityJump"
"canSpringBallBounce"
"canPauseRemorphTemporaryBlue"

Exit condition:

{
  "leaveWithTemporaryBlue": {}
}

Unlocks doors:

{"types":["ammo"],"requires":[]}

Dev note: This can be done at higher run speeds, with greater precision or an earlier jump through the door.