that sounds about right althought you fight the boss once you open the safe then you get the key go to the bassment open that locked that door...from their you should see a coffin open it and Vincent will be in side of it talk to him and if you say the right things he will tell you to bug off. leave the room and walk off down the hallway before you even get that far he will fly up to you and ask to join your team from their just add him to your line up.