Proxy or forward Backbone events through a mediator

backbone.events.extensions.js

(function() {

   var proxy = function(source, eventName) {
    var _self = this;
    source.on(eventName, function(evt) {
      var args = Array.prototype.slice.apply(arguments).splice(1);
      args.unshift(evt);
      _self.trigger.apply(_self, args);
    });
  };

  Backbone.View.prototype.proxyEvent = proxy;
  Backbone.Model.prototype.proxyEvent = proxy;
  Backbone.Collection.prototype.proxyEvent = proxy;
  Backbone.Router.prototype.proxyEvent = proxy;

  var forward = function(target, eventName) {
    var _self = this;
    _self.on(eventName, function(evt) {
      var args = Array.prototype.slice.apply(arguments).splice(1);
      args.unshift(evt);
      target.trigger.apply(target, args);
    });
  };

  Backbone.View.prototype.forwardEvent = forward;
  Backbone.Model.prototype.forwardEvent = forward;
  Backbone.Collection.prototype.forwardEvent = forward;
  Backbone.Router.prototype.forwardEvent = forward;

})();

This adds a forwardEvent and proxyEvent method to Backbone Models, Views, Collections, and Routers. The forwardEvent method listens for events triggered on the current object and triggers them on the target. The proxyEvent method listens for events on the source object and triggers them on the current object.

Shouldn't line 7 and 21 be this?

args.unshift(eventName);

As is it's not forwarding the event.