Requires around 19 tiles in the adjacent room.

Entrance condition:

{
  "comeInJumping": {
    "speedBooster": true,
    "minTiles": 18.4375
  }
}

Requires:

"canCrossRoomJumpIntoWater"
"canMomentumConservingTurnaround"

Dev note: This is on a spike in the speed graph, but would work even if it weren't. And higher tile counts work too. It is possible to jump through the door with a precise hero shot and another turnaround (possibly requiring a wide beam), but that is just to avoid a crouch jump.