Symfony 2: changing a user in a database does not cause a logout

I follow this guide:

http://symfony.com/doc/current/book/security.html

using a user user that implements the UserInterface class, however, I found that setting the password in the database (let's say the user changed it on the same basis that they thought were arranged), I found that the / Symfony class simply updates the login. Only if the username is changed does the user log out. Anyway, to change this behavior?