Angular: Problem on move list itens

http://angularjs.org/

HTML

<script src="https://code.angularjs.org/1.4.4/angular.min.js"></script>
<link rel="stylesheet" href="https://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
<div ng-controller="MyCtrl" class="container">
    <h3>Try to move elements</h3>
    
    <p class="form-group">
        Move element <input class="form-control" ng-model="moveFrom" /> to element <input class="form-control" ng-model="moveTo" />
        <button class="btn btn-default" ng-click="moveItem(moveFrom, moveTo)">Move</button>
    </p>    
    
  <table class="table">
    <tr ng-repeat="item in items" ng-class="{'warning': item == current_from, 'success': item == current_to}">
        <td>{{ item.id }}</td>
        <td><input ng-model="item.name" class="form-control" /></td>
        <td>{{ item.age }}</td>
    </tr>
  </table>
</div>

CSS

.form-group .form-control {
    display: inline-block !important;
    max-width: 50px;
}

JavaScript

var myApp = angular.module('myApp',[]);

//myApp.directive('myDirective', function() {});
//myApp.factory('myService', function() {});

myApp.controller('MyCtrl', ['$scope', '$timeout', '$interval', function ($scope, $timeout, $interval) {
    
    function moveArray(arr, from, to, n) {
        return arr.splice.apply(arr, [to, 0].concat(arr.splice(from, n ? +n : 1)));
    }
    
    $scope.working = 'Yes';
    
    $scope.items = ['Jane', 'Laurie', 'Megan', 'Jack', 'Robert', 'Bob'].map(function(d, i) {
        return {id: i, name: d, age: parseInt(Math.random()*100) };
    });
    
    $scope.moveItem = function(from, to) {
        moveArray($scope.items, from, to);
    };
    
    var initial = $scope.items.length-1, $run;
    
    
    $run = $interval(function($i) {
        //var from = parseInt(Math.random() * $scope.items.length),
        //    to = parseInt(Math.random() * $scope.items.length);
        var from = initial, to = (initial -= 1);
        
        $scope.current_from = $scope.items[from];
        
        $timeout(function() {
            $scope.current_from = false;
        	$scope.moveItem(from, to);
        	$scope.current_to = $scope.items[to];
            
            $timeout(function() {
				$scope.current_to = false;
            }, 800);
            
            console.log($run, initial);
            
            if (initial >= $scope.items.length || initial < 0)
                $interval.cancel($run);
        }, 800);        
    }, 2400);
    
}]);