Used by the routines at ScriptRoutine_AnimateTrapDoorBerk, Update_Berk_ReadControls, Berk_ReadControls_DownBranch, Berk_Interact_With_Entity, Berk_Pick_Up_Entity, Update_ThingUpstairs_Entity_State, ScriptRoutine_ThingUpstairsRaise, ScriptRoutine_ThingUpstairsResetRoom, ScriptRoutine_ThingUpstairsFillAttributes, ScriptRoutine_ThingUpstairsChase, Update_TaskTwoEntityState, ScriptRoutine_TaskTwoArmScriptFlags, ScriptRoutine_TaskTwoWalkVertical, ScriptRoutine_TaskTwoRiseOnEvent, ScriptRoutine_TaskTwoWalkRight, ScriptRoutine_TaskTwoWalkHorizontal, ScriptRoutine_TaskTwoSpawnHelper, Update_Task_Three_Entity_State, ScriptRoutine_TaskThreeQueueSound, ScriptRoutine_TaskThreeSeekBerk, ScriptRoutine_TaskThreeClearUpstairs, ScriptRoutine_TaskThreeBerkRightWindow, ScriptRoutine_SlimyDropAndHeat, ScriptRoutine_ArmCauldronFlags, Update_TaskFourEntityState, ScriptRoutine_TaskFourAlignCreature, ScriptRoutine_TaskFourRandomiseExtra, ScriptRoutine_TaskFourStepToward, ScriptRoutine_TaskFourArmScriptFlags, ScriptRoutine_TaskFourTickOfferItem, ScriptRoutine_TaskFourRaiseY, ScriptRoutine_TaskFourLowerY, ScriptRoutine_TaskFourBerkOverlap, Update_Vat, ScriptRoutine_VatQueueSound, ScriptRoutine_VatRoomTransition, ScriptRoutine_VatDecY, ScriptRoutine_VatIncY, ScriptRoutine_VatClearBit6AndReset, Collect_Entity, ScriptRoutine_CollectibleScanCounter, ScriptRoutine_CollectibleSetHeld, ScriptRoutine_CollectibleIncRoomTwice, ScriptRoutine_CollectibleIncXIfClearAbove, ScriptRoutine_CollectibleDecXIfClearLeft, ScriptRoutine_CollectibleLeaveRoomDown, ScriptRoutine_CollectibleLeaveRoomUp, ScriptRoutine_EndScriptLoop, ScriptRoutine_BerkDoorInFront, ScriptRoutine_BerkDoorBehind, ScriptRoutine_CloseTrapDoor, ScriptRoutine_OpenTrapDoor, ScriptRoutine_MoveHeldUpOneRoom, ScriptRoutine_StartLoop, ScriptRoutine_ResetDirectionFlags, ScriptRoutine_FaceRight, ScriptRoutine_FaceLeft, ScriptRoutine_FaceUp, ScriptRoutine_FaceDown, ScriptRoutine_JumpIfCarrying, ScriptRoutine_MoveLeft, ScriptRoutine_MoveRight, ScriptRoutine_MoveUp, ScriptRoutine_MoveDown, ScriptRoutine_MoveLeftTwo, ScriptRoutine_MoveRightTwo, ScriptRoutine_MoveDownTwo, ScriptRoutine_MoveUpTwo, ScriptRoutine_PutDownCarried, ScriptRoutine_PickUpHeld, ScriptRoutine_FaceLeftAfterPutDown, ScriptRoutine_FaceRightAfterPutDown, ScriptRoutine_PlacePutDownLeft, ScriptRoutine_PlacePutDownRight, ScriptRoutine_StartDruttScript and ScriptRoutine_ContinueToNextInstruction.

Advance the script pointer by two bytes and execute the instruction at HL. A zero high byte means a script opcode (dispatched via TableScriptHandlers); otherwise the word is a graphic layout address stored into the entity at IX.