Inside an event handler, this will be the element the event is bound to, and e.target will be the element that triggered the event (may or not be the same as this).
You are handing a blur event, not a click event. So, inside your event, you will have the element that you blured. If you want the clicked element, you'd need another event to get that.
blur can be triggered by other events, such as focusing something; not just clicking on something. So, there is no way to get the element that "caused the blur".