Rendering a template without changing the route in Symfony2 - php

Question

I've made a login function in which I render a template after checking the login and password. This's the form that i've made inside a template.
<form action="{{ path("login") }}" method="post" id="formulaire_connexion">
<label class="control-label">Email
<input type="text" name="email" id="email" placeholder="your#email.com" onclick="this.select()"/>
</label>
<label class="control-label">Password</br>
<input type="password" name="password" id="password" placeholder="*********" onclick="this.select()"/>
</label>
<input type="checkbox" id="remember_me" name="remember_me"><label for="remember_me">Remember me </label></br>
<button type="submit" id="connexion" name="connexion">Connexion</button>
</form>
And this's the logging check method :
public function loginAction(Request $request)
{
$mail = $request->get('email');
$pass = $request->get('password');
$oauth = new OAuth($mail, $pass);
$baseUrl = "http://api.localhost/v1/";
$connexion = "{$baseUrl}login/".$mail."/".$pass;
$oauth->fetch($connexion, $_REQUEST, OAUTH_HTTP_METHOD_GET);
$reponseInformations = json_decode($oauth->getLastResponse(), true);
if (!$reponseInformations) {
$data['erreur'] = "Bad credentials";
return $this->render('EspacePointDeVenteBundle:Authentication:authentication.html.twig', array(
'erreur' => $data,
));
}else{
return $this->render('EspacePointDeVenteBundle:Home:index.html.twig', array(
'reseau' => $reseau,
'identifiant' => $key,
'key' => $identifiant,
));
}
}
After a wrong login connexion I render the same login template, but the routing is changed to /login instead of havig /index per example. What I need to know how to keep the same routing even if we called a foreign method.