showSpeechOverTile(tileIndices, text, sound, duration) {
    return this.showSpeechAtPosition(UtilsEngine.transformBoardToTileMap(tileIndices), text, sound, duration);
  }
Shows a speech node over a tile in the game
@param {object} tileIndices - object with x and y properties representing tile indices
@param {string} text - string of text to show
@param {string} sound - resource string for sound to player
@param {number} duration - how long to show the speech node
@returns {SpeechNode} - SpeechNode being added to screen