function inMultiFingerRelease() {

      var withinThreshold = false;

      if (previousTouchEndTime) {
        var diff = getTimeStamp() - previousTouchEndTime
        if (diff <= options.fingerReleaseThreshold) {
          withinThreshold = true;
        }
      }

      return withinThreshold;
    }
Checks if we are in the threshold between 2 fingers being released
@return Boolean
@inner