Angus, the fissteck "dealer" who Jethro the Jailer pointed Geralt to, was supposed to be followed to his home which I, as a player failed to do. I managed to find his house (via a gaming walkthrough, but cannot enter, as it is locked and I have not seen the guy again (several saves later). Is there a work around for this, or do I have to go all the way back to before I confronted Angus?