This line will never be called. There is incorrect usage of [jQuery.each](http://api.jquery.com/jQuery.each/): first argument is `index`, but not a `target`.
Also, `aria-dropeffect` isn't removed on `target` drop. I'd suggest to use `null` instead `undefined` in line 240.

Result looks so:
```javascript
'toggleTargets': function (isEnabled) {
  var effect = isEnabled ? 'move' : null;

  this.state.baseImageEl.attr('aria-dropeffect', effect);
  $.each(this.state.targets, function (index, target) {
    target.targetEl.attr('aria-dropeffect', effect);
  });
}, ...
```