The multiviola will immediately reach Samus at the door when entering the room. By entering the room in a jump and aiming down, there is just enough time to shoot the multiviola. Or by entering the room aiming diagonally down and firing a beam shot.

Requires:

"canPrepareForNextRoom"
{
  "or": [
    {
      "and": [
        "h_canNavigateHeatRooms",
        {
          "enemyKill": {
            "enemies": [
              [
                "Multiviola"
              ]
            ],
            "explicitWeapons": [
              "PseudoScrew",
              "ScrewAttack",
              "Missile",
              "Super"
            ]
          }
        },
        {
          "heatFrames": 30
        }
      ]
    },
    {
      "and": [
        "h_canNavigateHeatRooms",
        {
          "enemyKill": {
            "enemies": [
              [
                "Multiviola"
              ]
            ],
            "explicitWeapons": [
              "Charge+Ice",
              "Ice+Wave",
              "Ice+Spazer"
            ]
          }
        },
        {
          "heatFrames": 60
        }
      ]
    },
    {
      "enemyKill": {
        "enemies": [
          [
            "Multiviola"
          ]
        ],
        "explicitWeapons": [
          "Plasma",
          "Charge+Spazer",
          "Charge+Wave"
        ]
      }
    }
  ]
}