code: function cutOff(options, callback) {
    if (typeof options === 'function') {
      callback = options;
      options = {};
    }
    this.logger('RollingSpider#cutOff');
    this.status.flying = false;
    this.writeTo(
      'fa0c',
      new Buffer([0x02, ++this.steps.fa0c & 0xFF, 0x02, 0x00, 0x04, 0x00])
      , callback);
  }
docs: Instructs the drone to do an emergency landing.