Output flash message of a particular type

Hello everyone. Quick question. Is it possible to output flash messages only of a certain type. I have this little script that collects form errors and assigns them to the flash object (I am using flash session - not direct);

foreach ($form->getMessages() as $msg) 
{
        if (!$this->flash->has($msg->getField())) {
            $this->flash->message($msg->getField(), $msg->getMessage());
        } else {
            $this->flash->message($msg->getField(), implode('<br />', $this->flash->getMessages($msg->getField())). '<br />' . $msg->getMessage());
        }
}

And if I try to do something like this:

$this->flash->output('Password');

I get an all the messages and they are being appended to the prevoius ones. More so, they are being displayed in a strange order putting all of the messages of a field password to the end.

Wrong email format
Required
Email must be at least 8 characters long
Password must be at least 8 characters long

This is what I get if I simply use $this->flash->output();

And this after I've reloaded a page a couple of times:

Wrong email format
Required
Email must be at least 8 characters long
Wrong email format
Required
Email must be at least 8 characters long
Wrong email format
Required
Email must be at least 8 characters long
Password must be at least 8 characters long
Password must be at least 8 characters long
Password must be at least 8 characters long