code: function () {
              var chart = this.series.chart,
                hoverPoints = chart.hoverPoints;
  
              this.firePointEvent('mouseOut');
  
              if (!hoverPoints || inArray(this, hoverPoints) === -1) { // #887, #2240
                  this.setState();
                  chart.hoverPoint = null;
              }
          }
docs: Runs on mouse out from the point